How to easily defeat any argument for God

[GrandizerII]

There's no ad hominem in saying that the arguments made by theologians can be quite ridiculous. 

Thank you, this is what I've been saying. 

It's not ad hominem if you address the arguments. It is ad hominem if you say the argument is bad because the motivation of the speaker is bad.

Also, never said motivations are necessarily bad. Why must motivations be bad in order for strong biases to play a role?

True, everything we do is motivated in some way. 

And strong biases are everywhere in evidence.

I'm not following you Belaqua. How is observing some arguments made by a group of Xs and judging that these arguments are really bad an ad hominem?

And theology, at least the revelatory one, does presuppose God and makes certain assumptions about it. This isn't reading psychically people's mind. You brought up natural theology to counter that, but as far as I'm concerned (and this is suggested in some of the philosophical articles as well) it's a field of its own separate from theology (which is usually interchangeable with the revelatory theology, or whatever it's called).