The complex of beliefs and rituals surrounding Easter and passover make it so complicated and strange that the farther I go from religion the more it confuses the hell out of me. During my Catholic youth, I wasn't really into questioning things - I just didn't think too hard about religion. But for the past two years the more I think, the more it hurts my head.
So I think this post requires some structure. I propose the following division to better enable us to proceed.
Christianity - Dead Christ, not dead Christ.
Judaism - Plagues, bloody doors and freedom from bondage.
Paganism - Bunnies, eggs, fertility, sex.
This is sort of a Christmas, Hanukkah, Yule, Kwanzaa, Festivus kind of thing. It's a tall order to teach this stuff to a kid. You may want to alternate across the festivals for every year - keeping #3 limited to chocolate bunnies and eggs of course.
Read more on my blog: Teaching Religious Mythology 3: Easter, Passover & The Pagans