You have a lively imagination. I think I'm a fairly representative atheist.
First, I didn't start with any “premise”, As a small child I was taught that the stories in the Bible were true, that Santa Claus existed, that messing around with electrical equipment would kill me, that I mustn't talk to strangers... and lots of other things.
Gradually, as I developed some common sense, gained some experience of the world and learnt more I realised that these things weren't true (or didn't apply to me). Nor could vampires, ghosts, fairies, monsters etc. REALLY exist. I guess I decided that the less believable a thing was, the less likely it was to exist and that to believe something almost totally unbelievable required some kind of evidence.
Most if this was a gradual process that I don't even remember being aware of.
I didn't do any reading about any of the things I didn't believe in (whether it be “God” or fairies) or seek interactions with like-minded people. I have never argued, “actively” or otherwise “for atheism”. There is no “objective search” to be made. I don't belive in God. If you or other people do then that's fine by me.