I quote my own post an another thread:
Religion and Type - An MBTI Perspective Someone's humorous ponderings.
Religion and Type - An MBTI Perspective
ISTP: Select something hardcore, preferably where you get to smite the enemies of God. Extremist Fundamentalist Islam is currently a popular choice


That's very accurate, I've always feel fun to integrate Al-Qaida, like some others ESTP too, just because terrorism is fun. A few years ago, I was a borderline extremist fundamentalit muslim, and I know a few ISTPs who're like that.
ESTP: You are hellbound anyway, so don't bother. Just sleep in.
Very accurate too. I remember that I've had a short period of religious integrism when I was 16, and my ESTP best friend have tell to me "Speed, yesterday night I was fucking a chick, I was stand up and she had her face pressed against the ground, screaming "oh yeah, keep to fuck me, fuck me!", THAT is a man, Speed, a man who will go to the Hell, but a man though".
And it was the end of my short religous period.
Actually, young males xSTPs muslims tend to appreciate especialy the virilious side of that religion. They want to have fun in the present moment (fun including sex, drug, alcohol, and even pig), but believe seriously they'll follow a more strict behavior growing older. (but personally, I feel it's just abstract project not likely to be applied)
By the way, I'm an ISTP and yes, I believe in God. But I don't practice any religion.