Le français ne vient pas du latin

Le français ne vient pas du latin (in English: French does not come from Latin) is a 2007 pseudolinguistics book by engineer and town planner Yves Cortez which argues that the Romance languages are derived not from Latin, but from a form of Old Italian. Unfortunately, the book fails to prove anything of the sort.

Contents
The book consists of a preface; an introduction; seven arguments against the idea that the Romance languages are descended from Latin; an analysis of why, given that Latin isn't the ancestor of the Romance languages, linguists continue to believe it is; a section dedicated to the consequences of the the theory of Latinity being disproven; a conclusion; and a glossary of linguistic terms. Curiously, there is no bibliography or list of references.

Introduction
Cortez outlines his theory of the origin of the Romance languages. According to him, there were originally two languages of Rome: Latin and Italian. Spoken Latin eventually died out, and only remained in use as a written language; the Roman vernacular was Italian. When the Roman Empire expanded, the various native populations abandoned their own languages and adopted the spoken language of the Romans, Italian. Cortez claims that linguists have attempted but failed to explain the disappearance of declensions, the neuter gender, the appearance of articles, and other characteristics of the Romance languages. He notes that Greek, German, and Russian have all retained their neuter genders, implying that therefore this should have happened to Latin as well (this is cherry picking, as will be examined in more detail below). Cortez lists a number of objections to the theory of Latin descent: Cortez notes various statements by linguist Antoine Meillet to the effect that Turkish and Arabic have remained essentially unchanged for millennia, and claims that this conservatism is also true of Greek. He attributes the similarities between the Romance languages and Latin to their common Indo-European descent and to borrowing due to the almost 2,000 years of coexistence of the spoken Romance languages and written Latin.
 * "How is it that the same grammatical forms have disappeared in all the Romance languages?"
 * "How is it that the same grammatical forms developed in all the Romance languages?"
 * "How is it that the same Latin words disappeared, and the same non-Latin words appeared, in all the Romance languages?"
 * "How is it that the most frequent Latin adjectives, adverbs, and verbs disappeared in all the Romance languages?
 * "How is it that Latin underwent such a dramatic change in only slightly under 400 years, from the fall of the Roman Empire in 450 until the first appearance of the Roman language at the Council of Tours in 813, when linguistic stability appears to be a general law?"