There are many Christians who practice witchcraft on this site- perhaps you should talk to some of them and get their views on it also?
In answer to your question- it depends on who you ask. Many Christians resort to the stereotype and are influenced under the perception that magic is 'evil', etc, etc. On the other hand, some are quite understanding and realize that magical practice isn't such at all.
Nowhere in the Bible does it say witchcraft is forbidden or anything similar to that: nor does it say you cannot still go to Heaven if you practice it.
This is often a topic for controversy. Also, as ChironJackal said, there is a lot of social prejudice related to Christianity within this site and other parts of the magical community.
I am sure Christianity was indeed perhaps influenced by aspects of Paganism in some way, or interpreting the same parts differently- however there is no blatant evidence that such is stolen.
When I was newer within witchcraft, I was curious on those who call themselves 'Christian Wiccans'. Yes, I know that not all Wiccans practice witchcraft and vice versa, and this particular post is specifically about witchcraft not Wicca, but I was more interested in the collaboration of the two religions and feel this may clear up some misconceptions on the term.
Admittedly, at first I was under the idea that it would be like calling yourself a 'Hindu Judaist'- the central belief systems completely clash.
Upon more investigation, I found that often it was meant one takes the traditional belief systems of Christianity, the teachings of Jesus Christ and so on, yet incorporates the path of nature found within Wicca. The 'Christian Wiccans' coven on here says as much:
''Christian Wiccans are those who still practice Christianity the old way, but add the beauty and natural path of Wicca. Most of us here have melded the two forms into a lovely, cohesive daily practice that enriches our lives and the lives of others. Many of us are seers, healers, and teachers of our ways.''
However, being a Christian Wiccan and a Christian witchcraft practitioner are very different. 'Christian Wiccan' states the collaboration of two religions, and 'Christian Witch' refers to one who is Christian, yet practices some form of witchcraft (whatever that may be).