I wouldn't say that. I think much that Paul wrote was good. His emphasis on the universality of God's revelation was very important. He certainly helped push the Nazarene movement into accepting people from all backgrounds. It is true that Judaism accepted proselytes, and fellowshipped with "godfearers" or gentile monotheists. But Paul really opened it up to allow everyone to become sons of God.
I would say also that Paul's theology was very influential in the writing of the gospels, so I think it is important to keep that in mind in reading them.