How do you get from "beginning of the universe" to christianity?

[Lek]

I believe christianity is true because I bellieve the witnesses who walked with Jesus. If Jesus could work the miracles that he did and then rise from the dead then I believe what he said. The writers of the new testament faced persecution, even to death, from lthe established Jewish leadership, from their own families and later from the Roman government. I just don't see any reason for them to lie. As for all those other arguments, if God is who I believe he is, he can create the universe any way he wants to, however that was. I didn't start from the beginning, but from the fufillment of all that was written about beforehand.