[Joker_vD]

The strange thing is, there are lot of cathedral churches with all sorts of demonic-looking creatures on them as decorations; not to mention quite an amount of folklore in which some saint or other would overpower the lesser imps with the strength of his faith and make them do his bidding.

[AStonesThrow]

Indeed, and if you look closely at iconography as late as the Counterreformation (and back to ancient Greece), you'll find horns on the head of Moses, Elijah, et. al., because horns signify wisdom rather than evil. The devil has been depicted with horns to acknowledge his wisdom.