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@Mandrakel
Not pussy footing, inevitably leads to oversights.
You may well have done but YOUR thread title is a question that askes : Why Do Theists Have Lower IQs? <<<<<<<<< that's a claim, that you have made? If you had the brains it may have served you better to have dropped the "why" from your title and you may have not painted yourself into a corner.....IF you had the brains.
"More specifically, behavioral factor analyses do not provide an unambiguous model of the underlying cognitive architecture, as the factors themselves are inaccessible, being measured indirectly by estimating linear components from correlations between the performance measures of different tests. Thus, for a given set of behavioral correlations, there are many factor solutions of varying degrees of complexity, all of which are equally able to account for the data. This ambiguity is typically resolved by selecting a simple and interpretable factor solution. However, interpretability does not necessarily equate to biological reality. Furthermore, the accuracy of any factor model depends on the collection of a large number of population measures. Consequently, the classical approach to intelligence testing is hampered by the logistical requirements of pen and paper testing. It would appear, therefore, that the classical approach to behavioral factor analysis is near the limit of its resolution."