The people you know are not witches. Whatever they are, they are not practicing the craft. There is no compatibility with other religious beliefs. Now, I have to say, a lot of Jews seem to be almost completely secular - it’s more of a cultural factor than a religion, so perhaps a Jewish witch is not a contradiction in terms. I think your examples are of people who are confused, that’s all. There is no such thing as a Christian witch. You either believe in Jesus Christ as the Son of God, or you don’t - you can’t carry on practicing witchcraft whilst going to church. Well, you CAN, but you aren’t being honest in either world.
We are not going to agree on “Wicca.” That term was adopted/made up by witches in order to soften and disguise the previous terms. “Witch” and “Warlock” just didn’t have the right tolerance in the general public, where “wicca” and “wiccans” somehow did. “Witchcraft” could not be deemed a religion but “Wicca” could be, and was. It’s all semantics.