I think this arguement is stupid... to even say that the christian easter has no connection with ALL the other spring festivals which celebrate rebirth is just obtuse, especially when most of them predate the christian one. I would also suggest that even the judaic festival has roots somewhere in Babylonia, Egypt and Sumeria, considering that Abraham was from Babylonia and the Hebrews spent a whole lot of time in Egypt as well.
I think the one thing i discovered, when poking my nose into the christian celebration of jesus' resurrection, was how many other religions had rebirth dates in spring. I never knew about dionysus' ritual rebirth on the vernal equinox. Lots of others too, as one earlier poster showed very nicely.
I was very shocked by this. I had always assumed that jesus' rebirth ceremony was unique to spring, as though resurrection myths and celebrations had no connection, before jesus, to spring. at all.
So the OP's argument is very welcome, since i think it shows how i felt before i started researching the christian celebration of jesus' resurrection. Since i was baptised roman catholic, became agnostic/atheistic when young and now am deciding that paganism fits my belief system, i'm probably a bit more understanding of why the OP's bias has not changed while researching this fascinating subject.
I myself have no use for eggs or hot crossed buns or stuff i plainly see as ritualistic (and i haven't really gotten into practicing any rituals yet, nor have children)...i simply focus on the astounding fact that rebirth celebrations at easter aren't the sole property of Christians.