I've gotta agree with Beave on this one.

I heard this argument from experimental astronomer Brian Keating recently on why he practices Judaism even though he maintains an agnosticism about the existence of God:

Keating talks about how religions distill accumulated wisdom from thousands of years of human experience, and provide a moral touchstone against which we can measure ourselves. It is the height of hubris to think that, as a lone individual, I can replace those innumerable generations' worth of moral thought.