I've been thinking about all the issues concerning these two religion, and I've came up with an idea.
Maybe the Christian god and Wiccan goddess are actually siblings. Now I know what you're thinking i'm crazy right? Well maybe you instead of attacking me for saying thing, you should stop and think about it for a minute.
These two religions are very similar regardless of their differences. They both follow the same concepts but in different ways. They both seem to think demons no matter what are evil and should be controlled. (This is, though more based on the individual.)
Both of these religions seem to bash each other at every turn. I think this is because they so similar at the core.
They both despite their outward appearances seem to agree upon the same concepts. They both worship in the same fashion. Are spells not the same thing as a prayer?
These are merely my opinions on these two religions it is not in anyway intended to insult or offend. These are my ideas on why these two can not seem to co-exist.