choosing an extinct animal that lots of Christians struggle to fit into a creationist ideology to represent rebirth and new life associated with the death of the son of a deity seems a bit odd?
Not in the least. Most Easter stuff is pre-christian anyway. Bunnies, eggs, flowers and all, they are all about spring, not Jesus. They actual Christian stuff seems to be pretty limited to actual church as far as I can tell.
So given that eggs are one of the long standing symbols, dinosaurs laid eggs, and dinosaurs are popular with kids, it seems fine to me. I don’t think Easter eggs are chicken-specific 🙂