Borrowing from Stephen Hawking, here is a "A brief history of Time":

It actually started in the first Century. First signs of pagan Christianity appeared in Israel. There was Hellenistic Church constructed complete with a mosiac of Christ represented as Helios in a mosaic on the floor. Even the use of images is alien to Hebraic Christianity, particularly with the prohibition in the Ten Commandments.

Things came to a head with Emperor Constantine, who sees a cross in the sky and…