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| The dreams of man|
|Disturbing your sleep|
“”Theology is the effort to explain the unknowable in terms of the not worth knowing.
|— H.L. Mencken|
Theology is - in a literal etymological sense - the study of God. In practice it involves the intellectual study of the assumed divine, of the nature of man within the context of some religious doctrine, and of religious "truths" from the position of a believer within a particular religion. Theologians - the gurus of theology - seek to improve their subjective understanding of divine revelation to better understand the divine. Theology differs from, but is closely related to, other disciplines such as religious studies which attempt to analyse religions and beliefs objectively.
Theology is not the same as apologetics or philosophy of religion, though in practice the three get mixed up quite a bit. Most of theology does not deal with apologetics, but apologetics routinely is based on "natural theology", which can be included in theology or in philosophy of religion.
Understanding theology for atheists
Imagine two nerds arguing about which would win in a fight: the Enterprise or a Star Destroyer. And then imagine that they were part of groups that had been arguing over these questions for centuries and had exhaustively documented everything. Finally, imagine that some of them considered what they were arguing about to be things that not only actually existed, but were literally more important than life and death (others just enjoy arguing). Madness? This. Is. Theology!
One of the roles for theology is determining what beliefs are to constitute the official doctrine within a religion at any given time. Early Christian theologians, for example, devised doctrines such as absolution, transubstantiation, purgatory, original sin, and the Holy Trinity, which are based on tenuous interpretations of Bible scripture rather than things clearly expressed in the Bible. Nevertheless, these remain major elements of Christian theology (especially within Catholicism).
These differing views on theology often cause schisms, when the standing body of a religion cannot agree on what theological views will be official doctrine. The most obvious example of this is the major split between Roman Catholic and Protestant Christians, during the Reformation. Protestants rejected many aspects of Roman Catholic theology and dogma, claiming it has little grounding in the Bible. The other major historical schism between Roman Catholics and the Eastern Orthodox Christians was equally steeped in theological differences.
Theology can influence political movements, as individuals or a church try to find common cause between religious ideology and political issues. In the other direction political movements can influence theology as they try to enroll the church in their causes. Examples, from left to right:
- Liberation theology is an attempt to blend Marxism and Christianity.
- Feminist theology is a focus on the role of the women in the religion as well as a study of the female aspects of the divine. In Neopaganism, this is manifested as the "Goddess movement." In Christianity, it includes the theological study of the Shekina, the role of both Marys in the church and their spiritual relationship to Jesus, as well as a study of the various women like Ruth and Rebekah who hold positions of honor within the Biblical narratives. Feminist theology addresses the cultural causes and effects of the demonization of Eve and Mary of Magdala. Necessarily, feminist theology must address the codified misogyny within the Bible, including 1 Timothy 2:12, which explicitly enjoins women from the ministry, and Ephesians 5:22-24 which seems to remove a woman's independence in light of her relationship to her husband.
- During the fight for women's suffrage, many of the key players, such as Susan B. Anthony and Alice Paul, were Quakers, being informed by that sect's strong belief in equality of the sexes. 
- Liberal strains of Christianity, such as that espoused by Martin Luther King, Jr., were a major driving factor behind the U.S.'s Civil Rights Movement.
- Social justice was, originally, an attempt by the Roman Catholic Church to apply theological concepts to the social problems of the 19th century. It gave rise to the economic philosophy of distributism.
- The traditional Christian Patriarchy was influential in politics and society and got support from many theologians. Augustine of Hippo for example thought women should be mere helpmates to men,  Thomas Aquinas considered that “woman is defective and misbegotten” Christian feminists claim misogynist male theologians spoke for themselves and their times rather than for God. 
- "Christian economics" blends Austrian school economics with dominionist theology to produce a highly toxic mess popular among the loony fringe of the American religious right.
Modern theologians have to address science in the context of theology, creating a host of possibilities.
- On the one side is the scientific denial seen in Young Earth Creationism and Old Earth Creationism.
- On the other side are liberal but controversial views of theistic evolution, or views that suggest God created all through the big bang, and the universe followed laws that God set up in order to become what we see today.
At least one organisation/journal exists that attempts to deal with the interrelation between theology and science.
Theology and philosophy
Theology and philosophy are very closely related to each other though philosophy does not start from faith based concepts. Many philosophical schools have influenced theology and vice versa. In the middle ages the two concepts were nearly inseparable and more modern theologians such as Soren Kierkegaard have had profound effects on many philosophical schools. This is especially true when it comes to questions such as free will or whether life has meaning.
While it is possible to get a degree in theology from any number of world-class universities - including Oxford, Yale, Harvard, Howard, and the University of Chicago - critics dating back to the eighteenth century have questioned the merits of theology as an academic discipline.
Theology is often criticized from people who are not believers. "What is the point of trying to study something you cannot even prove exists, using texts that are dubious at best (perhaps out-right frauds at worst), simply reinforcing the few remaining issues about the spiritual and natural world that have not been resolved by science?".
In 2012, atheist philosopher Maarten Boudry committed a Sokal-style hoax against a theology conference by submitting an intentionally absurd abstract, under an anagrammatic pseudonym, that was promptly accepted. Conference abstracts are not subject to peer-review, so getting this sort of material under the radar isn't as difficult as it might seem - and should a conference be desperate for the numbers, they might just accept any old rubbish to fill the slots. Yet, even a casual read-through of Boudry's abstract shows it to be clearly a load of nonsense. The opening sentences form a semi-coherent screed about Darwinian evolution:
In the Darwinian perspective, order is not immanent in reality, but it is a self-affirming aspect of reality in so far as it is experienced by situated subjects. However, it is not so much reality that is self-affirming, but the creative order structuring reality which manifests itself to us.
Boudry even managed to shoehorn Dawkins' name into the abstract, too, suggesting that we should "reframe our sense of locatedness of existence within a the space of radical contingency of spiritual destiny"[sic] — which is, somehow, contrary to Dawkins' own assertions. The lesson to draw from this? sometimes, "expertise" really means "using big words," and it doesn't take much to impress people who are eager to have their own views reinforced no matter what. As Jerry Coyne noted:
I defy you to understand what he’s saying, but of course it appeals to those who, steeped in Sophisticated Theology™, love a lot of big words that say nothing but somehow seem to criticize materialism while affirming the divine. It doesn’t hurt if you diss Dawkins a couple of times, either.
Where to start learning about theology (if you want to go down the rabbit hole)
Theology is by believers for believers, so the average logical non-believer (and many average, logical believers for that matter) needs to be prepared to do a lot of head scratching if they want to understand a given theology. Note well, if you are trying to stir the pot, prove "your theology is wrong", or bring up new points, with the 2000+ years in Christian theology, and the 4000+ years in some other theologies, that's not too likely.
Why would anyone other than an academic minded believer want to study theology? It can be extremely helpful in dealing with people of other cultures, especially if the rulers are theocratic. Understanding theology can help if you are working with people moving from one religion to another,  or moving out of a religion altogether, as it can prepare you for questions they might have, or concerns about the future. It might even be a simple source of amusement as one shakes their head saying "Ok, you think what now?" But theology can be taken seriously by believers, to the point that they can kill or die over their own religion's views of theology.
The first step to understanding any theology is to have a rough understanding of the tenets of a religion, and why one religion has separated from sister religions. If you do not understand, for example, the basic differences between Catholicism and Protestant Christianity, the minute details of the theology will likely escape you.
The next step is to have a familiarity with the various holy texts. It's not essential to read them too carefully, nor even cover to cover, since theology frequently exists outside of the holy texts, often only vaguely being grounded in the holy texts (despite endless claims otherwise). If you want to be armed from an atheist point of view, about problems with the holy texts, you can read commentaries like the Skeptic's Annotated Bible and the Skeptic's Annotated Qu'ran, both of which treat the holy texts as just texts pointing out things like logical inconsistencies in the text. They are not overly relevant, however, to understanding theology.
Finally, it's time to turn to actual works of theology. A good rule of thumb is to start with a work that was written for students of theology, rather than original source theology, such as Charles Caldwell Ryrie's Basic Theology. From there, Thomas Aquinas' Summa Theologica is a compelling, original source text, outlining views that are key to any Western Christian theology. Augustine of Hippo, Martin Luther and John Calvin are critical theologians in the Western Christian context. Similarly, non-holy texts that are foundational to a religion are perhaps even more important to understanding the theology of a religion, than the "holy work" itself. British Quakers have a book called Quaker Faith and Practice that is revised by the membership regularly. Catholics have the Catechisms, Jews have the Mishnah and Talmud, and Islam has the Kalam and Fiqh.
If you're interested in Islamic theology or Jewish theology, you'll need to learn how to read Arabic or Hebrew respectively. The Qur'an and the Torah lose a lot in translation, and the serious student needs to be able to read them in their original. The same applies regarding Sanskrit and Hindu texts.
- H.L. Mencken Quotes. Lock Haven University.
- See the Wikipedia article on divinity.
- Natural theology. Theopedia.
- The Enterprise can fight while moving faster-than-light, but a Star Destroyer is much heavier and can microjump much more rapidly than the Enterprise can move at warp (and is both bristling with weapons and carrying a lot of TIE fighters). If you're asking "Which Enterprise? And what kind of Star Destroyer?" then you probably have a hang of the dilemma.
- 1 Timothy 2:12
- Ephesians 5:22-24
- Alice Paul and Her Fight for Equal Suffrage: 1910-1920
- Augustine on Women: Misogynist, Apologist or Simply a Mixed Bag?
- What is Feminist Theology?
- John Polkinghorn, (theoretical physicist), is perhaps the most well known theologian trying to reconcile science and traditional Christianity
- CTNS;Theology and Science
- Theology in the university
- The conference was hosted by the philosophy department of VU University Amsterdam, but was organised by the Association for Reformational Philosophy, which is "grounded in the Calvinistic tradition and inspired by the statesmen Guillaume Groen van Prinsterer and Dr. Abraham Kuyper, the founders of Reformational philosophy developed their thought, on the one side against traditional Christian philosophy on account of its scholastic nature and, on the other side, against the Modern secular philosophy on account of its humanistic mindset." i.e., theology and apologetics.
- Maarten Boudry > Robert A. Maundy
- Jerry Coyne. A Sokal-style hoax by an anti-religious philosopher. Why Evolution Is True. 2012 September 25.
- for that you need more than one theological tradition
- If you want to know how good a translation is, a good rule of thumb is to turn to the Song of Solomon - if it reads like erotic verse with archaic imagery you probably have an honest translation.