Your question (part of it anyway) is pretty much your answer. "...as projected by the church" says it all.
The earlier response that Raymond M posted clearly shows Christianity's intolerance of Wicca based on lack of familiarity of any opposing viewpoint, as well as an unwillingness to listen. People like Raymond really scare me. Not because of his faith, but rather his comdemnation of other faiths and the people that follow them. Honestly, have you ever heard of anyone being killed by a fallen angel?
Hmmm...maybe if the angel actually landed on you at the end of his fall...but I digress.
In order for a new religion to gain a majority following (Christianity was new at the time, remember?), it usually has to discredit the existing religions, to make people feel like they're doing the right thing by converting. The easiest example is how Christianity, or at least some denominations of Christianity, demonizes Earth-based religions (Wicca included) by saying it is the work of the devil. There really is no evidence to support either side, other than each religion's own sacred texts, which of course will always support their respective religions. It's not limited to just Christianity vs. Wicca. Many religions are not very tolerant of each other. In fact, it's difficult (but not impossible) to find a religion that is totally tolerant of other religions.
Think of it like a presidential election. The candidates usually try to point out each others' flaws in order to gain votes for themselves. Rarely do they try to get elected based on their own merit.
I don't think there is one answer that will fit everyone for this question. Probably the best thing to do is to study a religion, either by research on the internet, or by attending a service or two, or by talking to people who follow that religion. Better yet, do all of those. Then make a choice on your own as to whether a religion is "good" or "bad" for you. A great place to start is: http://www.religioustolerance.org
My advice is to follow whatever religion(s) provide you with personal and spritual enrichment. Follow more than one if it fulfills you. Just make sure that your choice is YOURS.
It's one thing for someone to say why a religion is wrong for themselves; quite another for them to say why a religion is wrong for everyone else.