Celebrity Christianity and the Balaam spirit

What is crazy to me is that the only sermons I’ve heard on Balaam put the emphasis on the donkey—Not the fact that God spoke through a prophet who practiced witchcraft. Shouldn’t we know about this since Revelation 2:14 says this spirit will be active in the last days: But I have a few things against you, because you have there those who hold the doctrine of Balaam, who taught Balak to put a stumbling block before the children of Israel, to eat things sacrificed to idols, and to commit sexual immorality.