What is the most effective chain of thoughts that a theist can make, that will make him realise that there is no God?
"People not in my tribe are sexy and cool. I want to be like and/or mate with those people. I believe I have a sufficient chance of successfully joining and gaining status within the tribe with sexy and cool people in it. I will now change my signalling beliefs."
I'm pretty sure that at least some theists are sincere, rather than using belief-as-attire.
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.