I contend that the core of religion is its quality of transcendence beyond the limits of human thought, perception, and emotion. This is not to say that nothing may be said of the divine, but that the stuff of our realm does not exhaust the mystery. We can’t have God utterly figured out, for it would be impious of creatures of finite knowledge to presume such knowledge that would fill up the dark hole of absolute mystery. I turn to the Christian theologian, Karl Rahner, and to the Hindu Rigveda to support this point, which is valid, I submit, for anything that is (or can be counted as) a religion.

The full essay is at "Religious Transcendence."