magick [as in spell casting] is a neutral energy, its the caster who makes it 'good' or 'evil'. it has no specific deity worship. you could pray to a deity or you could just rely on the energy, it doesn't matter. if you are of a religion that is against magick and witchcraft, then you might run into some roadblocks, but magick can be done by anyone at any time, it comes down to your personal view if magick is 'evil' or not.
short answer, magick is neither 'good' nor 'evil' by nature. it is how you use it.