Romans 3:1 Then what advantage has the Jew? Or what is the benefit of circumcision? 2 Great in every respect. First of all, that they were entrusted with the oracles of God.
No Catholics mentioned. Your issue seems to be with the Holy Spirit.
Paul is talking about the Old Testament. With the New Testament there is, as Paul said, no distinction between Jew and Greek. This also was inspired by the Holy Spirit. Again, the Gospels of Mark and Luke were written by non-Jews.