[init4fun]

As someone who is not at all religious, I'll say this from the viewpoint of an outsider;

You appear to be taking a pretty big leap there, assigning your belief of how you think these religious people operate within their religion, on people you don't really know. How do you know that they all literally (think that) they hear "God's voice in their heads", VS them just following a dusty old manuscript from ages long ago gone by?

The whole "cause God told me to do it" thing hasn't fared too well in modern times (think Jim Jones or perhaps David Koresh here), and as such, I haven't heard too many folks admitting to having daily chat sessions with God where they are being given specific instructions from him (or her, or it), YMMV.