You know, it always weirded me out, that whole time gap where apparently the Not-Quite-Dead Guy was wandering around Jerusalem and no one noticed until he popped up in front of his old crew and went "Yo. Sup?" and they went "eeek." Cue the "Well, now that your sufficiently freaked out, and also saved and therefore totally going to heaven, I'm out. See ya at the end of the universe! Milliways is the happening joint, froods."

And then they went about and Peter got huffy with Mary and Mary got kicked out of the New Super Secret Cool Kids Book because she was a girl and girls were so not cool (and possibly had cooties and no souls as well). But the Romans were vastly annoyed by the whole business and started substituting Super Secret Cool Kids for Purinacus Lion Chow, which was very not good for the Super Secret Cool Kids, but gave the lions beautifully shiny coats and healthy teeth.

And all was angst and lion breath until Constantine went "You know, you're a bunch of hoopy froods. Let's do lunch. We can reorder time and the calendar over pseudo-cannibalistic bread and wine. We'll need some holidays... the pagans aren't going to need theirs anymore since Charlemagne's going to kill them anyway..." No one noticed the bunny slipping past the gate.

That, children, is where we got Easter. Because in Pagan times, giant rabits came from the east, bearing mildly-addictive sugary substances and painted eggs for the fertility festivals. When the Christians took over Easter as the spring holiday, they were going to kill the rabbit, but they couldn't find the Bunny Trail. When they did find the Bunny Trail, the rabbit dropped anvils on their heads. So eventually they gave up and just hid the eggs to amuse themselves.