Fanatics... I have met a couple. I have met a few fanatical Christians, too.
“I agree, which is why I don’t affirmatively deny a higher existence; I just have no belief in it.”
Interesting. Makes sense. And an important distinction.
So are you an agnostic?
http://en.wikipedia.org/wiki/Negative_atheism
It would be wonderful if God and an afterlife existed, but in the absence of evidence I have no reason to think that it's so...but I don't know that I'm right in the manner that those who affirm or deny God's existence think that they do.