I say exactly what I think on my religion tests all the time. My teachers -- to date -- don't mind if I disagree, as long as I understood the material, and as long as -- when I do put down the "wrong" answer -- I provide a good, substantiated argument.

In fact, once, there were two essay questions, and I only answered one of them (As in max-points-possible=50/100), though I did cover it very thoroughly. And I basically said our church is all wrong. I still got an A. Can't say whether your teacher is quite so open minded though...

SigmaX