Was a fundie for a long time, but basically in the six months leading up to admitting I was a Satanist, the draw was... almost ungodly, shall we say? I was already exploring taboo things, and discovered real Satanism by accident. Totally wasn't what I expected.
I gave essentially my whole life story on it here though, in two consecutive posts:
http://www.religiousforums.com/forum/2993573-post14.html
http://www.religiousforums.com/forum/2993574-post15.html
When I think of it... had some really messed-up stuff happen in my life, lots I didn't include in there, and some stuff I'd rather forget ever happened. However I didn't "become" a Satanist because I was hurt as my Christians think, but ultimately because it was my nature.
However sometimes it doesn't help that my path is currently self-help/overcoming of many of my emotional issues due to my childhood or mental health. Christians like to use that as ammunition to rationalize that I "joined" Satanism out of desperation or spiritual confusion, or that somehow it is me wanting to express my anger and hate at the religious upbringing I had on and off as a teenager. Right now, overcoming and conquering all of that is part of my path, as it is an obstical to my greater Satanic goals. Though they won't have that same argument once I get over most of those issues, am over I'd say a third to half of them after a year or so of consciously practicing Satanism. So right now, Satanism is a religion of healing by overcoming my problems. hey! You might say that I am healing myself through my own willpower... Jason means healer, and Will as in willpower... jasonwill, two important parts of my path... the jasonwill2 path! lol. (actually it stands for jason and william as being a duality of my ego, but shhhh)
erm, sorry to ramble on