However, it is possible to launch arguments against theism which are so deep as to take out the entire spectrum of religions, including Buddhism and New Age spirituality, in a single blast. See e.g. excluding the supernatural.

Oh, no doubt. I have not done a whole ton of studying in that area (yet; thanks for the link) but I find it interesting that people do not start from the core instead of picking away at the fringes. If you can knock out the foundation, why bother with the attic?

Of course, this only invalidates at least one central element of every religion - perhaps their scriptures say somewhere than the sky is blue, or such; reversed stupidity is not intelligence.

In addition, I never thought that a religion assumes belief in the supernatural, but I am rusty on some of these definitions. I just know that people disagree about it.

(Edited out; thanks komponisto) I am not familiar with the term "reversed stupidity" but I do not see what intelligence has to do with irrationality. Am I missing something?