I have noticed that theists have an aversion to the word theory. As it is mostly attached to evolution, and they have a deep misunderstanding of what the word means.
I'm probably botching the following statement but the general idea is as follows. It has been said that whoever sets the parameters of the battle or frames the argument wins. Theists continue to twist the meaning of words to confuse and help their flocks remain blind.
What if we started using some of their tactics against them. Frame the points of discussion. Stating belief in god as a theory anytime we discuss it with friends, neighbors, and forums may help some analyse what a theory actually is and how the theory of god does not move into the category of provable truth. In contrast to evolution and so on.