Evolution of Religion by Naturalistic Social Processes

1. If Christian theology and the church have a supernatural origin in an omnipotent God, then why has theology and the church evolved through naturalistic social processes over time?
2. Why does theology change from the beginning of the Bible to the end? Why are the later writings influenced by Greek thought (for example, immortality)? Why is there such a large theological gap between the Old and New Testaments? The changes are not explainable by the idea of "progressive revelation," or by any systematic theology.
3. Why was the doctrine of the Trinity unknown to the church until the fourth century? Why was the doctrine established by vote instead of by revelation? Why was the membership of the voting council loaded with Athanasians? Why was belief in this then-new doctrine made a condition for membership in the church? Why were Arians exiled and executed?
4. Why is Jesus so similar to the other 15 suffering saviors of mythology? Why don't Christians believe any of the other virgin births and savior stories recorded in ancient literature? How is it that the ritual of Christian communion existed in the prior pagan ceremonies of eating the body and drinking the blood of their gods? How is it that the Christian ritual of baptism also existed in the prior pagan cults? Weren't the very defining doctrines of Christianity actually assimilated from the endemic pagan cults? Likewise, why are Easter, Christmas, the Lenten season, rogation days, and others, derived from pagan holidays. Didn't Christianity have any legitimate calendar of commemorations of its own?
5. How did liberal churches come to exist? If they are inclined to believe, why did they not continue to believe the "fundamentals?" Could it be because the fundamentals have insurmountable problems that discredit them?