text: You'll find historically that Christianity is very adept at supplanting previous practices. A look at ancient Rome provides a good example. There is no historical evidence that Jesus was born on Christmas day (more likely, in September about 3 years earlier) but the founders of the ancient Church used the celebration of Saturnalia and the birth of Jesus to seamlessly slide in their creation story. The same goes for Easter. There is no historical evidence that the crucifixion happened on that particular lunar holiday but it was a great way to give people a celebration to take the place of pagan Spring rituals. Christianity has historically been very malleable and thus has been very successful.