The “gospels” preached by men, and even angels, carry serious consequences to those preaching them, as they are not received through the revelation of Jesus Christ. Paul says he was not taught the gospel, even though he advanced in Judaism beyond many of his contemporaries. He says it did not originate with man. Galatians 1:11.
Paul’s remarkable claim is that he received the true gospel by the revelation of Jesus Christ.
The true gospel came from revelation to Paul resulting in revelation in him. Galatians 1:12,15,16.
“But I make known to you, brethren, that the gospel which was preached by me is not according to man. For I neither received it from man, nor was I taught it, but it came through the revelation of Jesus Christ.” Galatians 1:11,13.