I think this was all banned to keep it simple, and focused on the now. If reincarnation is accepted, then a lot of people would say, sin now, and repent later. Plus, the early Christians were of simple minds. They couldn't wrap their minds around it. (I'm into astrology, and I heard that the Pope had one of the biggest astrology libraries.) Then, organized religion can be controlling. (No offense to all the good, church-going Christians. Every organization has its flaws.)