It's a great thing, isn't it? When your faith instills fear in you. Okay, you don't have to call it witchcraft, you can call it "aligning with 'All that is.'" Because that's what magic is; getting your emotions aligned with universal power. And that's exactly what prayer is, too.
There are many Christian witches out there. People who have reconciled the two things. There are also those who say that Jesus was the most powerful witch who ever walked the earth.
You don't have to launch yourself into full-scale circle casting or anything like that; you can just be easy about it and try some ideas out for size. These might help: