I am not religious, but this is simply prejudice, and it doesn't belong here. What a sheltered life you claim to have led, not to have met anyone "smart" who is also religious.
I think smart is the application of intelligence, and while intelligent, the religious are not "smart" in that area.
I mean, I try not to be, but let's be honest—I wouldn't know if I was.
Perhaps, although maybe in my social bubble in London, Christians just aren't all that common, smart or otherwise. My last interaction with a Christian was my ex-neighbours. Lovely friendly family, or so we thought until we saw & heard them carrying out exorcisms on terrified, screaming children in their kitchen. I called the police.
I don't think all Christians are like that either. My grandma was a Catholic, and one of the most selfless people I have ever known.
Most of the monotheistic religions seem to me a little like still believing in Father Christmas, and the same "get em while they're young" method of indoctrination is often used. If I meet someone who is religious, in my head I'm thinking about the practicalities and (how does such a fat man get down the chimney? How does he know which children have been naughty and which have been nice? And how does he get through all those houses in one night?).
And I'm not prejudiced. Pointing out gaping inconsistencies in someone else's argument or belief system goes not constitute prejudice. I totally support people believing in whatever they want to believe as long as it doesn't impact on others right to do the same. My personal belief is that Father Christmas does not exist, and any grown-up believing that he does is fucking ridiculous.
I do like mince pies though.