Yep. Study after study has shown that charitability is directly correlated most strongly with religiosity. And also with limited government social services.
One of the first responses you hear out of the mouths of liberals when you bring up the disparity in charitability is that conservatives are rich and can more easily give (really, I'm not sure how they manage to classify us as both rich elitists and nuckle-dragging hicks....). Then you mention Mississippi, which is both our nation's poorest and most generous state.
Next in line? States like Tennessee, North Dakota, Alabama, and Utah. Not exactly liberal territory....
Mark