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Here's an interesting quote:

Young adults who identify themselves as "not at all religious" have an average IQ of 103 during adolescence, while those who identify themselves as "very religious" have an average IQ of 97 during adolescence.

Their source: Data from the National Longitudinal Study of Adolescent Health

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This is perhaps misleading, and not just because IQ tests have known social/cultural biases.The same data will likely show similar disparities in IQ between other complimentary groups, e.g. between children with well-educated and less-educated parents or even between boys and girls.

e.g. between children with well-educated and less-educated parents

Well surely we should expect a genuine difference in intelligence between children of well-educated and less-educated parents? At least under the assumptions:

a) Intelligence is at least partly heritable, and

b) More intelligent people are likely to get more education

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