"Belief and nonbelief are two giant planets, the orbits of which don’t touch. Everything about Christianity can be justified within the context of Christian belief. That is, if you accept its terms. Once you do, your belief starts modifying the data (in ways that are themselves defensible, see?), until eventually the data begin to reinforce belief. The precise moment of illogic can never be isolated and may not exist. Like holding a magnifying glass at arm’s length and bringing it toward your eye: Things are upside down, they’re upside down, they’re right side up. What lay between? If there was something, it passed too quickly to be observed. This is why you can never reason true Christians out of the faith. It’s not, as the adage has it, because they were never reasoned into it—many were—it’s that faith is a logical door which locks behind you. What looks like a line of thought is steadily warping into a circle, one that closes with you inside. If this seems to imply that no apostate was ever a true Christian and that therefore, I was never one, I think I’d stand by both of those statements."
From Upon This Rock by John Jeremiah Sullivan.
An essay about Christian rock.