I read that Easter actually comes from the praising of the god Ishtar, and that the egg symbolizes fertility. So basically, you have that theory, and then you have the celebration of fertility and sex.
Easter has nothing to do with Christianity. A tribe from somewhere, was forced to convert to Christianity, but in order to keep their traditions alive, they celebrated with eggs, which they believed was a sign of life and fertility.
It is true, in fact, Easter is the day of Jesus Christ's resurrection. And it is also true that it's the greatest holiday of them all