[hueving]

>God in classical theism is not a "thing" among things.

Neither is an invisible horse. These all fall under the category of things that there is no physical evidence for.

>So wouldn't it be helpful, for the sake of the thought experiment proposed by shawndumas, to at least see where his reasoning leads?

No, because his entire premise is based on the existence of something that follows no logic or physical laws. Something that violates the laws of logic cannot be reasoned about.

[anglican1549]

But an invisible horse is referencing a thing simply without the accidents of visibility, but a finite thing nevertheless.

You're still trapped in a category Christians (or any traditional Theists) don't believe about God. We're asserting X, you're attacking Y.