One interesting thing about Mouse Guard is that it seems to have no religion whatsoever, as far as I can tell. No priests, churches, etc. The bats some some kind of belief in "souls" (at least for bats) but I haven't found any mousy beliefs in the supernatural.
A second interesting thing is that, no matter how evil, or alternatively, no matter how crude, mice never use words that would turn into something like "*********" on many message boards. The closest to profanity or even political incorrectness I have found in the comic is "oldfur" and even that could simply be descriptive.
Or am I wrong in my observations? I only have read Fall 1152 and issue #4 of Winter 1152, so for all I know Saxon swears like a sailor.