There's a lot of examples to choose from. But if Paul was just there to stir up a false Gospel, why did he jump all over the Corinthians for not having the proper respect for Holy Communion? (1 Corinthians 11:27-30) For that matter, why would he have even gone to the trouble to teach about Holy Communion to a bunch of Pagans if he was just there to deceive them?
The Eucharist is a fairly complex concept that still produces a lot of disagreements among Catholics and many Protestant denominations.
Paul could have just left that part out and not have had to go to the trouble of chastising the Corinthians about their casual way of doing it. It would have made life much simpler for him.
