Easter had nothing to do with Jesus in anyway until Christians said it did. Same for Christmas. Both were large holidays for many other religions and cultures. In an attempt to squelch pagan rituals, Christians created their holidays and celebrated them "coincidentally" at the same time as the pagan holidays.
In coming with the mixing of both pagan and christian holiday's things got mixed together and the sign of renew and fertility got placed on the rabbit. Same for Christmas with the Christmas tree, that came to be because of a mix of Egyptian culture blending with Christian.
Ding Ding Ding! There were about 12--15 different pagan religions all with the same characteristics as Christianity. Christianity merely copied other religions with the holidays.