Jhine and Caleb,
Numerous studies suggest the two most successful groups in the US, based on household income, are the Jews and Hindus. So religion isn't necessarily an impediment for success or intelligence, as Jews and Hindus, at least those in the US, typically rate high in overall IQ.
There are several reasons for this. Both Jews and Hindus (US) have cultures that encourage higher education, and both of these groups are among the highest educated in the US. Also, both of these groups are more likely to view being a Jew or a Hindu as a cultural identity rather than a religious one. I date a Hindu and know a lot of Hindus; their tolerance for other religions is exceeded, a lot of times, by their lack of interest in all things religious. Of course there are religious Hindus, but even they are doctors, lawyers and indian chiefs.
It is similar with Jews (sorry Caleb - you are the expert here, not me - I am simply quoting a dear friend of mine, which also is supported by studies). I have a very good Jewish friend who was one of my MBA profs. He has 2 doctorate degrees and is now a counselor at West Point. He keeps kosher, deeply respects his religion and its culture, traditions and legacy, won't date a non-JAP (Jewish American Princess when I asked) - and he is an atheist. He tells me this is common amongst US Jews. Their culture, as the Hindus, is vitally important to them. Religion, or even a belief in god, not so much.