Is Paul a prophet in Islam, and are his epistles revelation, and are they part of the Gospel?

Paul was not a prophet, as there was no prophet between Jesus and Muhammad (peace be upon them both). Paul appeared after Christ and claimed affiliation with his call, then began to preach Christianity, though the source of his call is unknown. Paul was initially one of the staunchest enemies of Christianity, then suddenly converted to it. His principles were not received from the disciples of Christ; rather, he began to preach them, establish churches, and write letters that became the foundation of Christian teachings.

Historians believe that Paul's call aimed to corrupt the message of Jesus, not to reform it. Ibn Taymiyyah likened him to Abdullah ibn Saba, who sought to corrupt Islam. As for his letters, which Christians included in the Gospel, they are not a revelation from God, nor is there proof that they are from the knowledge of Jesus, as he did not meet him. The four Gospels in the hands of Christians were written after the ascension of Christ, and they contain sayings and actions attributed to Christ, but not all of them are the word of God, and they contain errors.