Where has God spoken about this? In the Bible? But Wicca is a modern religion–it wasn’t around when the Bible was written, so the Bible can’t possibly speak clearly and directly about it. The Bible says things that may apply to Wiccan practices, but there’s a lot of interpretation, literary, historical, and theological, that needs to take place before one can conclude this.
The problem, I think, is that Wiccan propagandists, especially in the early years of the movement, have claimed that their modern religion is what the people accused of witchcraft in the past were “really” doing. Which, of course, naturally leads many Christians to assume that Wiccans “really” practice what the “witches” of the past were accused of practicing.
In fact Wicca is a modern religion with a nostalgic appeal to various non-Christian movements and practices of the past. Wicca has, at most, as much to do with the real “witches” of the early modern period as fundamentalist Baptists have to do with the real Waldenses and Albigenses–which is to say, precious little! And, of course, historians argue over the nature of the “witchcraft” of the past too (which is why early Wiccans, and less scholarly Wiccans even today, could get away with claiming that these “witches” were really practicing a pagan religion of which they are the modern continuers).
Edwin