That was not the gospel he preached in Luke 9:6.
Jesus even tells them not to tell anyone He is the Christ.
That is not the gospel Paul taught.
Luke 9:21-22 KJV
(21) And he straitly charged them, and commanded them to tell no man that thing;
And then,
after they have been preaching a gospel in Luke 9:6, they are told that Jesus must suffer and die.
(22) Saying, The Son of man must suffer many things, and be rejected of the elders and chief priests and scribes, and be slain, and be raised the third day.
What does Peter do when he learns that Jesus must suffer and die; ..... he
opposes it.
Matthew 16:20-22 KJV
(20) Then charged he his disciples that they should tell no man that he was Jesus the Christ.
(21) From that time forth began Jesus to shew unto his disciples, how that he must go unto Jerusalem, and suffer many things of the elders and chief priests and scribes, and be killed, and be raised again the third day.
(22) Then Peter took him, and began to rebuke him, saying, Be it far from thee, Lord: this shall not be unto thee.
That's not the gospel Paul taught.
