If "separate forum" works for you, why not "separate website"? It sounds as if we almost agree.
Allowing you to avoid that which you wish to avoid is one thing. That’s called accomodation. Removing religion altogether from a Constitutional Conservative website would go beyond accomodation and into exclusion.
From a practical point of view, if exclusion were to be practiced, it would be you who would be excluded, since agnostics and atheists are in the minority on Free Republic. But, you’re not excluded, are you? We’re being more accomodating to you, than you apparently would be, if roles were reversed.