Yeah, that works. If I had to edit it myself I would do something like this:

A note to the religious: you will find LW overtly atheist. If you'd like to know how we came to this conclusion you may find these related posts a good starting point. We are happy to have you participating but please be aware that other commenters are likely to treat religion as an open-and-shut case. This isn't groupthink; we really, truly have given full consideration to religious claims and found them to be false.

Just food for thought. I trimmed it up a bit and tried being a little more charitable. I also started an article on the wiki but someone else may want to approve it or move it. The very last sentence is a bit aggressive, but I think it is the softest way to make the point that this is an unmovable object.