Do people actually believe this?
Man's relationship with the Creator began from the moment that man was created. However, that relationship was spoiled when Adam and Eve thought they knew better than God, and did the one thing that He had said they should not do. Although this event, known at the Fall, resulted in a broken relationship with God and increased hardship, God did not abandon man, and continued to make provision for man to have a relationship with Him. Over time, God made several different arrangements for and with man. These are known as covenants.
God chose one man, Abram, and a group of his descendants, with whom to have a special relationship, one that would benefit all of mankind. Those descendants were all the descendants of Jacob, Abram's grandson. God gave both new names. Abram became Abraham, and Jacob became Israel. Those descendants have been known at different times as the Sons of Israel, Israelites, Jews, and Israelis. God promised mankind that He would "redeem" (buy back) the lost relationship with him, and promised the Israelites that He would send a "messiah", or deliverer, to deliver His people from their hardship. This relationship of the Jews to God became known as Judaism.
This messiah turned out to be the second person of God Himself (God is a trinity, or three persons in one), Jesus. (The name Jesus Christ means Messiah Jesus.) Although God is spirit, Jesus became human, born of a woman, and spent about 33 years on Earth, during which time He taught people more about God. He then took on Himself the punishment man deserved for rejecting God, and was tortured and executed. However, being God, He returned to life, then returned to heaven, and left in His place, the third person of God, the Holy Spirit.
If so then they are certifiable. It's fiction fafuxache!