According to the bible, humanity started with just two people and grew from there. This population also had direct contact with God for several centuries, yet where did all the other religions come from then? It makes sense that there would be some change over time (like the variations in Christianity) but what about the ones that are polytheistic? The majority of these show no relation to the Christian God, and could not have evolved out of the single initial belief as you faith would claim. Then theres the Native Americans, whose spirit beings hold almost no similarity to the Christian God. Even when we examine history, monotheism was a relatively late belief. If man was originally created with belief in one specific God, where'd the others come from?