I concur with Sylvana - although religion does have a tendency to attract cheap thinkers, it's not the only thing that does so.
I think that religion is a supporting crutch for many people and the best way 'not to suck at their religion' is to provide that person with space to grow and explore their own mind (which is not always given, especially in intensive religious melting-pots like the Bible Belt), along with support/facilitation to bring that person out of their religious shell, to actually think about some of the bits their religion dictates is too damaging/frightening/immoral to think about.
Teach the person to think well and, if my guess is right, they'll be much less sucky at many things.
God, I can talk some bullshit when I want to. Sorry everybody.