It's got nothing to do with railing against anything. I just have a problem with people assuming that I believe the things that they do, which many people tend to do. It's why I prefer generic "I'll be thinking about you / let me know if you need anything" and "sending good thoughts," because it doesn't assume anything about me or my family. And in my experience, (just from the people I've known," it's really not a big deal for them either. "Oh, I'll pray for you," is something that I think makes them feel better - which is fine, for them.

But mostly I just don't like people assuming that I believe the same thing without even stopping to consider.