Despite what Curt Sibling says, it is not a certainty that the Christian message is false, no matter what year it is . . .
My religion does not, particularly, celebrate the crucifixion. However, we do see it as part of Jesus' overall mission to allow all humans to one day live after death, and be reddemed form our sins. The crucifixion was part of this, and it shows the sacrifice that he was willing to make.
The fact that rebirth is a major pagan theme doesn't mean that it is false in Christianity, just that humans saw the rebirth inherent in nature which is just a foreshadowing of Jesus' rebirth.
The celebrations of Easter all come from paganism, but I never attached religious significance to the Easter Bunny, so it doesn't matter.