The great thing about a computer notebook is that no matter how much you stuff into it, it doesn't get bigger or heavier. — Bill Gates. American businessman and philanthropist (born 1955) Computers
Just in terms of allocation of time resources, religion is not very efficient. There's a lot more I could be doing on a Sunday morning.
I don't think there's anything unique about human intellience. All the nuerons in the brain that make up perceptions and emotions operate in a binary fashion.