Which religion prays to Michael the Archangel?

The prayer you cite is Roman Catholic. Please note that, contrary to fundamentalists' false ertions, Catholics pray to saints in hopes those saints will JOIN us in petitioning god. This is the same principle as asking a friend to speak to a superior on our behalf. Do Catholics NEED to pray to saints? No. Does it help to have someone with influence take up our cause? Couldn't hurt!