Creed is not a Christian band
Depends on who you ask, but most people will agree that they at least have strong Christian alt-rock influences. Allmusic for example...
"Based on their frequently spiritual lyrics, some observers lumped them in with a new breed of alternative-styled Christian bands that had begun crossing over to the mainstream; however, Creed tried to distance themselves from being pigeonholed as an exclusively religious band out to convert their listeners."
Not that there is anything wrong with that of course and I do like a few of their songs.
-Mike