Some more data from the philpapers.org survey have just been released. Some conjectures which I have long held seem to be supported by the data. The free will debate is a largely US debate, it seems to me. Relatively few people are interested in the UK, and even fewer in Australia. I think that part of the explanation of this phenomenon is that the US is an outlier in religious belief. Theism is much more common in the US than in most other developed countries. Since many religious believers hold that libertarian free will is required to justify eternal damnation (or salvation), libertarianism is also more common in the US. This explains why the debate is so lively in the US; this, in turn, attracts other philosophers to it (non-theists and theists with other views).
The correlation data in the survey supports the hypothesis. Libertarianism correlates quite highly with non-physicalism about mind; physicalism about mind, on the other hand, correlates highly with atheism. More directly, libertarianism also correlates quite highly with theism. Thoughts?