[madnak]

You're not arguing that religion is rational, you're arguing it's in the human nature. I agree with you. But that doesn't make it rational. What you "fill in" with regard to vision, or memory, etc, is frequently inaccurate. This inaccuracy increases as things become "stranger" or further removed from concrete practical reality.

And this "filling in" is certainly not rational. It's not necessarily "irrational," as irrationality tends to imply conscious thought, but the brain fills things in according to ingrained patterns, not reasoned calculations. It's almost literally a "knee-jerk" type of response. And yes, I think using a knee-jerk response to determine the basis of life, the universe, and everything is irrational.