And you read that where? You know that how?
Are you doubting that St. Paul was celibate, or that he administered the Sacraments? Perhaps it is the word Catholic that distresses you.
Romans 15: 15-But I have written very boldly to you on some points so as to remind you again, because of the grace that was given me from God,
16 to be a minister of Christ Jesus to the Gentiles, ministering as a priest the gospel of God, so that my offering of the Gentiles may become acceptable, sanctified by the Holy Spirit.
Contrary to the best efforts of the Reformation's propaganda instruments St. Paul was not a Protestant.