Others are also welcome to comment, but I'm curious about what took from a position of traditional theism (Christian) to where you are today? Was it a gradual dismissal? Life change event? Something else entirely?
For me it was a very gradual dismissal. The way I like to put it is that I didn't so much look up one day and say to myself "I do not believe that god exists," but rather, it was more of a situation where I was regularly looking at my inventory of beliefs and one day noticed that "god exists" wasn't there anymore. I don't think I'd be able to pinpoint a particular time, not even a year, when I lost my belief in the existence of god. Nor do I think that moment coincided with my embracing of the self-label 'atheist'. I think that came some time later.
One thing I can say though is that my introspect regarding concept of hell was one of the primary kick-starters in terms of 'causal impetus to fundamentally reexamine my beliefs regarding this particular topic (e.g. god, religion)'. I've oft said that, from a more holistic perspective, that the actual change and 'deconversion' stemmed from a genuine desire to take my religion (Catholicism) more seriously
I'm also curious if you would have considered yourself devout, or simply more of an attender/consumer of religion? Did you ever feel close to your faith or the object of your faith?
For me it's more appropriate, I think, to say I was somewhere in between 'devout' and 'cafeteria Christian' (attender/consumer). The beliefs were earnest, squishy and malleable as they were, but I neither took too much stake in what either scripture said or the head of the church said. It was largely a progressive variant of Catholicism, allowing my perception and experiences of the reality I lived in to help inform my views regarding my religion. In retrospect, I wonder if that aspect of my religious practice was synonymous with me attempting to find some feedback loop on the whole matter. I'm unsure of that though.
If you have questions for me, as a believer, also feel free to ask. I'm sure, in some ways, you probably can identify with aspects of my worldview that put you in a position to ask some unique questions.
If god suddenly rescinded his offer of salvation, what would you do?