Magick does not have to be anti-Christian. Some of the most powerful magick users I've ever known were Christian.
We work with the angels and sometimes with God himself. Prayer is magick. Church is ritual. Christianity and magick are not mutually exclusive.
When most people think of magick, they assume it is pagan. Not all magick comes from pagan beliefs. Your beliefs are not important to magick, only your will and focus are important.
You'll have to decide for yourself what religion you wish to practice, but that does not mean you can't be Christian and still work magick.
Heck, haven't you ever heard of a faith healer? What do you think they're doing? I'll tell you. It's magick.