When it comes to making fun of something, Religion is an easy target with its strange rituals, simplistic views, homophobia and complete lack of any evidence for their beliefs so let's take that road most trodden and heap more scorn upon it by seeing how it 'stole' Easter.
Easter was a pagan festival celebrating the spring equinox and based on the phases of the moon however early Christians absorbed it into the newly written story of Jesus's death and resurrection and turned it into the Easter we enjoy today.
The story of Jesus dying on a cross and being resurrected was already a well worn story in the ancient world where there was already plenty of older once dead and then resurrected saviours too.
The Sumerian goddess Ishtar was hung naked on a stake, and was subsequently resurrected and ascended from the underworld as did the Egyptian God, Horus and Mithras and Dionysus.
As Christmas is also a takeover of an already existing festival, basically, the newly formed Christian church piggy-backed on any major celebration it found when it was pushing its new religion and said 'Hey, you're already partying, why not party for this guy' and supplied the wine, bread and fish and over time the original deity was edged out of the picture to leave Jesus in the middle.
Don't let it put you off your chocolate eggs but once Easter is all over, you may want to have a bit of
a rethink on this whole Christianity thing because if you do believe it all then you obviously haven't thought hard enough about it.