Indeed not. According to the current, best practice (scholarship), Paul's stuff is the oldest that's still around.The Gospel of Mark is about a failed Jewish Messiah.
The Gospels of Matthew, Luke and John are about a pagan demigod.
Note that nothing in Paul's epistles demonstrate that he knew a single thing in a single Gospel, canonical or otherwise.
And I also find it interesting, that Paul never describes his jesus as a human--ever.
I can easily see how the religion evolved, from a fairly common idea of a celestial-being-savior-sacrifi ce-reborn one.
Into one that sports a human element, with the 1/2 man 1/2 god meme which makes the central figure more ... human, and more accessible than one of pure spirit.
Oh, would that Constantine didn't need a new, custom-written religion to prop up is ailing Empire.
We'd still have a world of thousands upon thousands of completely different, minor religions that nobody really takes seriously.
Instead of a world with 3 major, murderously-competitive ones who think, because of popularity, they are justified in their murderous activities...