Much false doctrine has been added. I dare say that you could go into any church on any Sunday and find something un-biblical, either unintentionally in the form of some tradition or purposely for a variety of reasons. And while there are not many claiming to be prophets today there are plenty of false teachers who are very good at what they do. Peter sums it up nicely.
2 Peter 2:1-3
“But there were also false prophets among the people, even as there will be false teachers among you, who will secretly bring in destructive heresies, even denying the Lord who bought them, and bring on themselves swift destruction. And many will follow their destructive ways, because of whom the way of truth will be blasphemed. By covetousness they will exploit you with deceptive words; for a long time their judgment has not been idle, and their destruction does not slumber”.
The primary motive behind such false teaching is greed. They do not hesitate to take hurtful advantage of their followers in order to enrich themselves. Their words promise much, but their ability to deliver is nil, therefore they are properly accused of exploiting by deceit. Their teaching is flattery; their ambitions are financial; their conscience must be dulled, and their aim is deception. Obvious to some, irresistible to many.