Despite the clams of people on this website, actual Wicca and christianity cannot mix- the core beliefs are incompatible.
But, some people have labelled, erroneously, what they practice as Wicca.
My opinion is, why label what you want to do?
Just practice what you wish to practice, you can pick up a basic book on magick, which is not necessarily a part of witchcraft, and adapt it to your own personal needs.
Witchcraft is the study of nature and natural processes. If you want the magick brand, you just take the deities name in any text book or spell you wish to practice and you use Jesus, lord, whatever. It matters not.
In my line of practice I use the Jewish god-names all the time, I am not Jewish, nor do I worship that God. I am merely calling on the principles he represents and attuning my mind to those principles.
Jesus is a solar deity, there are loads of catholic saints which can, and often are, used as substitutes for pagan gods and goddesses.