I don't think religion has all that big a part in supersitition. Mostly I think superstition is a way of trying to explain why good or bad things happen to people.
Of course you can say it's all in the mind, but you'd be surprised how powerful the mind is.
For example, my favorite superstition is the Macbeth curse. Whenever you say Macbeth before a performance on stage, the play goes horribly wrong and/or someone gets hurt.
I once upset my entire theater class by dropping Macbeth every other second on the opening night of Diary of Anne Frank.
Well, sure enough, not only did all hell break loose, but the girl who played Miep nearly broke her neck tripping on the "stairs" off stage.