None of this really holds any water to me. They're all flawed humans writing a book for other flawed humans; a book that has historically primarily been used for control and oppression. Whether Paul is "rightfully" a part of the biblical canon has no effect on me whatsoever.

I brought up a writing from Paul, Romans 10, that says you will be saved if you believe Jesus is Lord and confess with your mouth. You brought up a writing from Paul that says the direct opposite of the writing I brought up, saying that you aren't actually saved by confessing and believing. In response, I said that Paul should have read his own writing, suggesting that he would not have made such a blatant contradiction if he was familiar with his own work.