Could be any number of reasons why the divorce rate is higher among "religous" people then atheists...
Would it be possilbe that "Religous" people get more pressure from family/friends/church to marry? Maybe more get married then would have without that pressure?
Maybe the social oppertunites provided by like minded people in church, increases people exposure to others like them and give them more oppertunite to cheat?
Maybe social stigma attached to "SEX" in a church, makes extramarital sex seem more exciting.
Maybe it has to do with economic factors and some corelation between that and typical christian vs.other faith groups?
Who knows... Just throwing out some possible reasons other then the obvious...
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Herbal vaporizer