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I'm a christian,and i use magick.it works for me.u don't really need to worship other gods/goddess,u can still use it through the power of archangels.and GOD.i created a banishing spell by calling on archangel micheal.sometimes i may ask God to lend me the power to use a spell(NB:ur heart must be pure,believe in God).

This probably isn't what you're looking for, but I guess it's worth mentioning: Did you ever consider hoodoo? Most practitioners are Christian.

http://en.wikipedia.org/wiki/Hoodoo_(folk_magic)