According to this study. Again this defies the eager hopes of those who believe Western Enlightenment must necessarily lead us on a Hegelian progressive march toward atheism.
The 2008 ARIS study shows that the educated elite (those with postgraduate degrees) church at near the same rate as the rest of the country, though there are interesting differences. For example, 19% of the elite are mainline Christian (Methodist, Lutheran, Presbyterian, etc.) whereas only 13% of the American population are. (In other news, mainline Protestantism continues to lose members.) In the category of "other Christian," which is probably too broad to be interesting, educated elites identify at 25%, the American population 38%. (I assume this last difference can be explained by the smaller percentage of the elite who identify as fundamentalist evangelical.) The elite identify as "nones"---i.e., no religious affiliation---only 2% more (17%) than the population at large (15%).
Interestingly enough, according to this study, educated elites have religious marriages (86%) more often than the rest of the population (72%). And yet, not surprisingly, they accept human evolution at a higher rate (48%) than the rest of America (38%).