I would have to say that in performing my magic, I do not use it to minister to anyone. Rather, I use my magic to meet people, become friends, and then minister to them when I'm not doing magic. I think it's to hard to mix Christianity and magic, because it makes it confusing.
Here's a more detailed path, which I will use the story of my friend, who we will call Bob.
I knew of Bob and had greeted him several times before, but I never really spoke to him much. One day, he was around and I had a pack of cards with me, so I decided to perform for him. He thought the magic was great and entertaining! We got to talking and soon became friends, since he wanted to learn magic as well. I taught him several small sleights (such as a DL) and then lead into the ministry like so...
"Bob, you know how magic amazed and stunned you?" He replied with a, "Yes." I said, "It wasn't real, but there was a man long ago, his name was Jesus Christ, and he is the Son of God, and he could actually perform miracles. Not magic, but miracles. Because he was 100% God and 100% man..."
That's how I approach the situation. Hopefully that can help you in some way. But, I must be going. God bless!
Tyler