This here is informative. Thanks Tom Riddering from MN Atheists.
Quick! What do eggs, flowers, the East, maidens dancing around phallic symbols, the vernal equinox, fecund rabbits, chicks, flowers, Mardi Gras, estrus cycles, and Christianity all have in common? SEX!
Well, Christians actually call it Easter, named after Eastre, the Germanic fertility goddess, which comes from the same origin as the word "east." Why east? That's where the sun rises! The same spring sun that shines on those brightly colored chicken ova and brings new life to the earth -- flowers, chicks, bunnies, and the occasional god. Jesus wasn't the only god allegedly reborn around the vernal equinox. There was also Adonis, Osiris, Perseus, and Orpheus.
Spring is when we have the licentious festivals of Mardi Gras, Carnival, and the ancient Roman fertility festival of Lupercalia. It's when the Kanamara Matsuri (Festival of the Steel Phallus) is celebrated in Japan. Nothing subtle about those Buddhists and Shinto! It's when pre-Christian pagans all over the earth celebrated the return of life after the dark death of winter and propitiated their gods for a successful growing season by celebrating their fertility. The early Christian church couldn't eradicate this popular festival, so they hijacked it and assigned new theological meaning to it. But under all that sanctimonious piety, Easter is nothing but the spring fertility rites. Now that's something even atheists can celebrate!