No, you can't be a Christian Wiccan. One is a polytheistic religion (worshipping more than one deity) and the other is a monotheistic religion (worshipping only one deity). Having said that, while you can't be a Wiccan and Christian at the same time, the practice of magick can be done in Christianity. Magick is nothing more than the focusing of one's energy to create change in one's life.
P.S. As a practicing witch, I find it offenseive that you think the devil is in my practice. Let me assure you, the devil has no part in MY religious beliefs; he is in YOURS.