I'm sure they'll let you discuss whether or not evolution is a religion in the Religion forum any time you want.
But in order to get the same kind of protection from religious zealotry that other religions get by opening caucus and ecumenical threads, you have to acknowledge that it is a religion. I, for one, don’t have any problem with scientism being called a religion and treated as such — it might put an end to the continuous flamewars on the crevo threads. If it looks like a duck, quacks like a duck, walks like a duck, flies like a duck and isn’t a goose, it’s probably a duck — so it might as well enjoy the benefits of a duck’s life by calling itself a duck.