Belz...
Fiend God
It is illogical that the Gospels were written after Paul's Epistles. Such a scenario makes no sense at all.
You forget that a Pauline writer admitted that over 500 persons, plus the 12, Cephas and James was seen of the resurrected Jesus BEFORE him.
You forget that a Pauline writer claimed that there were Churches in Christ BEFORE him.
Over 500 persons knew the story of the resurrected Jesus BEFORE Paul.
In fact, a Pauline writer claimed he was the LAST to be seen of resurrected Jesus.
Now, if Jesus did ACTUALLY LIVE then the actual story of Jesus MUST have been known before the Pauline Corpus.
If Jesus did ACTUALLY LIVE and did ACTUALLY PREACH then the Jesus story was known before the Pauline Corpus.
If Jesus was ACTUALLY DEAD before Paul preached Christ crucified then the Jesus story was already known BEFORE the Pauline Corpus.
If Paul presecuted the followers of Jesus AFTER he was ACTUALLY DEAD then the Jesus story was known before the Pauline Corpus.
Origen and Eusebius claimed Paul knew the Gospel according to gLuke.
The author of the Muratorian Canon claimed Paul wrote the Epistles AFTER Revelation by John was already composed.
The story of Jesus from Conception to Ascension was known by Paul.
You are conflating two things (I have the odd impression of seeing a pattern, here) : The gospels, and the story of Jesus.
As far as I know, nobody is claiming that the Gospels were the original stories of Jesus. Are you ?