Christians by which authority did Paul write his so called Gospel?

Another good example of someone making Christ over into their own image.

Christ called Paul, and Paul did as he was instructed. If there is a problem, it lies with you, and not Paul.

There is no gospel of Paul.

Paul wrote letters to other Christians and the authority comes from GOD ......!

The fact that you have attributed a gospel to Paul (a mistake unlikely to be made by a sincere believer) shows that you have not investigated the issue enough to make the authoritative assertions contained in your "question".

There's no gospel of Paul, slick. Paul wrote epistles.

paul made his own authority ie none, the gospels were written in the 3rd century by unknown greeks for the european church of rome , nothing to do with palestine or judaism

We are told that the apostles confirmed his vision and apostleship. Christ taught mercy and forgiveness and that it's possible to be evil and become good. Paul himself is a perfect example of this in action, as even he points out.

he was with space ghost

Yes. Paul was selected by Jesus while Saul was on the road to Damascus.

If you read that account, you will understand how Saul of Tarsus was changed, and renamed to Paul.

So the authority came from God.

There are no contradictions, and I notice you did not cite any. So you can set that illusion aside. Your confusion may be based on a lack of understanding.

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"were written by people that lived with Jesus Christ " -- ummm, no, they weren't, lol. The actual authors are unknown, and it was a common literary device to write books like that in those days and attribute them to a fictional character.

If you think any of the gospels were written by people who were there, it is you who need to open your eyes.