Sayf ibn Umar claimed that certain rabbis persuaded Paul to deliberately misguide early Christians by introducing what Ibn Hazm viewed as objectionable doctrines into Christianity. Ibn Hazm repeated Sayf's claims. The Karaite scholar Jacob Qirqisani also believed that Paul created Christianity by introducing the doctrine of Trinity. Paul has been criticized by some modern Muslim thinkers. Syed Muhammad Naquib al-Attas wrote that Paul misrepresented the message of Jesus, and Rashid Rida accused Paul of introducing "shirk" (polytheism) into Christianity. Mohammad Ali Jouhar quoted Adolf von Harnack's critical writings of Paul.