Welcome, Diagoras!
I was never a 911 CTist, but in my salad days I believed in all sorts of things. Being a "bit" older than most on this sub-forum, I actually lived through Bay of Pigs, Cuban Missile Crisis, JFK Assassination, et al... And being a creature of the extreme left, I was willing to believe anything bad about anyone in any official position in any arm of any government. Except, of course, for Uncle Mao and Uncle Joe - they were cool 'cuz they were saving humankind from its own greed and worst instincts.
And just to get things straight for Red, who has difficulty with the concept that anyone could ever question his/her own fuzzy thinking and beliefs, there was NO SINGLE EPIPHANY that woke me up. A little reading here, paying attention to videos and television shows, listening to what some of the "other guys" were saying, and most important - questioning what was coming out of the mouths of some of my own side.
I think the first wake-up call was the Paul is Dead scenario. Man, was that fun for about 36 hours. And then Paul came out with an interview and I realized it had all been just nonsense. The shock was the people who absolutely had to defend their silliness and continue with more and more elaborate deceptions and clues to prove that they were right all along. This is what the 911 TM has had to resort to.
In defence of the 'gradual enlightenment' that Diagoras describes, I have to say that I never actually sat down and did an inventory of my beliefs and start dissecting them. I still believed in at least six of the JFK theories (and that in itself began to wear on me - how could everyone in the world have been in on it depending on whose book you read most recently).
I believed, and still believe to an extent that Pearl Harbor was, while not an outright conspiracy, at least a bit of a set-up by FDR, hoping the Japanese would attack but just not realizing how devastating the attack would be nor when it would occur.
And don't get me started on that Trojan Horse thingy! (Did I mention that I'm a little older than most of you?) C'mon - a bunch of guys hiding in a big wooden horse that the Trojans just conveeeeniently took inside their fortified walls! Obviously an inside job!