I would say that for me 1. was how it started. It never sat right with me that homosexuality or other LGBT stuff was evil... I'd known people that were in committed, healthy marriages (17 years strong), and nothing about that seemed wrong to me. The concept of that sin didn't jive with me.
Other sins and behaviors of god in the bible bothered me to the point where I couldn't just ignore them anymore, so I sought answers to my questions. I began testing the bible's historicity and logicality, and then I discovered contradictions and other things that had no explanation outside of the bible being man made (as far as I was concerned)... I became convinced that even though god was real, and good, the bible didn't reflect god as the good and loving being I had come to know him as.
With that, I began to explore other religions that also portrayed a merciful and loving monotheistic god. I became a seeker and sought after this idea of god.
As time went on, I questioned my own idea of who god was, and whether or not god even existed, or whether or not god would even be good given the way nature would reflect his character. After finding no clear answer, I became an agnostic and explored other god concepts such as polytheism and pantheism. They weren't really for me, though, as they left me with the same questions my previous encounters with religions had left me.
Eventually, I couldn't really find anything that could convince me that an actual god even existed, and I no longer really felt the need to follow or pursue gods, so I dropped religion altogether. Oddly enough, I've picked up some of my pagan practices because I feel that I dropped them before fully exploring them, so I still do things like runecrafting from time to time just for fun.
I may join a different religion in the future, but if I do it will be on my terms rather than in seeking any kind of god. I can't see any ideas of god being convincing enough for me to become theistic anytime soon, but we'll see! I still try keeping an open mind about things.