Having found myself a theist who accepted there was no empirical test which would determine whether that belief was true or not, I figured the best way to test my belief in God (and my religious position more generally) was to argue with smart people. A "Science Maths and Philosophy" forum on a poker web-site seemed to me to have a decent level of filtering ensuring I'd get confident critique from intelligent people so I started posting there.
Over about six or seven years, my theism clarified a little but didnt really shift substantially*. I basically held the view that theism could be rational although a choice of religion was irrational (and forced). I went the usual rounds with the usual suspects and ended up predominantly arguing with other theists.
Over time, the spiritual experiences which had sustained my theism began to be less infrequent and to be less compelling. I suspect that the ongoing criticism (from Original Position and a guy called luckyme who hasnt posted much since RGT was formed unfortunately) contributed to that, but eventually it just kind of faded away.
One day I realised that not only had I not had any kind of "prayer experience" for a few months, but the whole thing seemed far more plausibly to have been caused by conditioning/parental rebellion/etcetera. It wasnt any particularly big deal - I just went back to being a strong atheist. I argued with atheists for a bit longer (I think weak atheists are just epistemological wusses) but couldnt see much point.
I dont have much interest in arguing with theists other than Jibninjas (since he seemed willing to debate minutiae and had a number of strangely irritating viewpoints
). I'm curious about what they think but dont see any reason to persuade them they're wrong.
End of story really - ended with a bit of a whimper (becoming a believer was far more traumatic!)
*