Here's an interesting idea: Religious survey researchers should go to seminary to increase the accuracy and usefulness of their survey questions. This idea is put forth in an article by Pete Enns, discussed on Scot McKnight's blog.
Now, after 5 years undergrad, 7 years grad, and 2 years post-doc, there's no way I'm going back to school, but the article makes a good point. My neighbor, who is a retired pastor, has pointed out a couple of theological ambiguities in my book, and it would have been better for me to have known about them.
Maybe there's a market for MDiv consultants in survey research?