There are many groups teaching false doctrine for true and true doctrine for heresy. Over time I would like to list some of them here because these have listed the Oneness Apostolic faith as holding FALSE DOCTRINE for truth and have declared Oneness believers to be heretics.
Christian Discussions is among them. They do not believe that God is one person. Perhaps they think God is a schizophrenic MPD sort of deity. I am not sure what they believe since they have declared practically every Biblical belief system to be heretical. Perhaps they think that they are the only true church.
See for yourself: