What was the big process? Heh, in a way, nothing more complex than discovering that people he thought had to be demon-possessed were actually human, just as human as he was, and also shared beliefs in common. But we can't have that now, can we? ;)
When I was a teenager I figured Presbyterians and Episcopalians were all spiritually dead legalists hung-up on meaningless rituals. Heh, and now I'm at a Presbyterian church with some Reformed Anglican sympathies.
You could say that somewhere along the line Trogdor burninated my preconceptions. Of course cessationists will keep drawing a single line through every heretical movement they can think of from the dawn of time along into Montanism and up to the present so that they land on Pentecostalism as a continuation. Of course if any of these cessationist types are also dispensationalists they may want to rethink how ardently they assail their fellow Christians. ;)