Why would you want to believe in god?

[CapnAwesome]

Short of indoctrination and maintaining familial ties, why believe?  Assuming an person has no psychological or developmental disabilities, the lack of evidence, or masses of evidence to the contrary should be obvious.

What keeps an otherwise intelligent adult believing in the supernatural?

It's the power of childhood conditioning. Most people retain most of the beliefs of their parents, whether religious, political or whatever. Religion is even stronger because most people in the world grow up in whole communities where everyone has the same belief. Hard to shake all that for most.