Well, it is Church doctrine that every word contained in the Canonical epistles is indeed the written Word of God. Paul wrote much of those epistles.
So, you must be referring to people who do not respect this doctrine.
Those would be utterly schismatic, at best, and likely heretical into the bargain.
Not a group which is going to have much pull in the One, Holy, Catholic and Apostolic Church.
IMHO.
Or are you referring to some writing by St. Paul NOT contained in Holy Scripture?
Guess I was wrong. Islam must be winning the battle for the hearts and minds.