Do anti-evolutionists tend also to be anti-abortion, anti-same-sex-marriage, (in the US) Republican rather than Democratic, etc.? Why, yes, they very much do, which by Stefan's heuristic suggests that their anti-evolutionism is likely to be the product of their religion. Do evolutionists tend to have positions opposite to those? Probably yes, but not to nearly the same extent.
1) What is the extent? "Probably the same extent" doesn't really help you here if you don't know what it is.
2) This would suggest that the arguments for same-sex marriage were motivated reasoning 20 years ago, and the arguments for atheism were motivated reasoning 100 years ago. What the heuristic is really detecting is popularity, because unpopular beliefs tend to have much higher correlations with other beliefs.
What is the extent?
One can often compare things better than one can quantify them individually. I expect there are more Baptist preachers in the United States than in Bolivia, but I couldn't tell you how many there are of either.
In the present case, it seems to me that almost all anti-evolutionists just happen to be adherents of conservative forms of religions like Christianity and Islam that involve a relatively recent divine creation, which happen also to have something of a tradition of opposing abortion and homosexuality. (The link with right-wing p...
Here is a new paper of mine (12 pages) on suspicious agreement between belief and values. The idea is that if your empirical beliefs systematically support your values, then that is evidence that you arrived at those beliefs through a biased belief-forming process. This is especially so if those beliefs concern propositions which aren’t probabilistically correlated with each other, I argue.
I have previously written several LW posts on these kinds of arguments (here and here; see also mine and ClearerThinking’s political bias test) but here the analysis is more thorough. See also Thrasymachus' recent post on the same theme.