Paul opens by giving his credentials to write this epistle. Who teaches in the church? Verse 1 answers by telling us that it is those who are called by God.
So many today, for example in the charismatic movement, make it up as they go along. They innovate like crazy; they are making things up all the time, new teachings that no one has ever heard before. So no, they can't possibly be called of God, because the true minister is called to preach only the word, and to expound and apply that.