I find your theory less likely. Why would he adapt and spread teaching he himself was prosecuting? And made up a story and risk his life for it? It makes no sense.
There are not "my theories?" Paul says he received all his teachings from visions:
(
Galatians 1:11-12;
Romans 10:14-15;
Romans 16:25-26).
Paul simply changed his theology, he was already a Jew and then he decided the accepted the stories about the Jewish messiah. Obviously at some point he began to encounter people who had some new writings about a messiah and he became convinced.
You do realize there are millions of people who are in a religion and then read about another faith and convert? This happens still today so how could this possible be considered strange back then?
Your logic is like "well Jesus must have been a real demigod or why else would Paul convert?
Uh....I don't know, how about the millions of other conversion stories to and from every religion and cult ever where people just heard the "good news" from other people???
Paul claims to have persecuted anti-temple Jews but obviously was converted with an updated savior messiah version of Judaism that took away the need for the temple. Hellinizations of religions was happening all around Paul in other religions and now the Jewish version was here.
People converting to religions or to updated forms of a religion does not mean they are true. It does not mean claims of visitations by celestial beings are true. Joseph Smith and Muhammad also did not likely have a visit by a celestial being. But it made their story and claims have much more weight.
It also allowed them to make some of the new theology into "divine words from a divinity".
Total scam.
Next Paul did not risk his life by converting. No one cared. On his 3rd mission he violated laws regarding temple behavior.
Some of the narrative you are putting forth is not from the authentic Epistles. It's from Acts which is most definitely historical fiction.
The leading scholar on Acts is Richard Purvoe:
The Mystery of Acts: Unraveling Its Story
"The author of Acts unwittingly committed a near-perfect crime: He told his story so well that all rival accounts vanished with but the faintest of traces. And thus future generations were left with no documents that recount the history of the early Christian tradition; because Acts is not history. According to Richard Pervo, 'Acts is a beautiful house that readers may happily admire, but it is not a home in which the historian can responsibly live.' Luke did not even aspire to write history but rather told his story to defend the gentile communities of his day as the legitimate heirs of Israelite religion. In The Mystery of Acts, Pervo explores the problem of history in Acts by asking, and answering, the fundamental questions: Who wrote Acts? Where was Acts written? When was Acts written? Why was Acts written? How was Acts written? The result is a veritable tour-de-force that enlighten, entertains, and brings Acts to life.
"This is the most important book I have read in five years. Bravo Pervo! Summarizing the discoveries made during the writing of his magisterial commentary on Acts, this little book makes it wonderfully clear that there is little if anything of historical value in the book of Acts, apart from what it can tell us about the community that wrote it. In one fell swoop, the only basis of support for the traditional model of Christian origins has been eliminated. It is now possible to entertain seriously other models of Christian origins, including the theory that Christianity did not begin at any particular place in space or moment in time, but rather began like the ancient religions of Egypt, India, Greece, and Rome. The fact that as soon as the curtain goes up on the stage of Christian history there is evidence of division and "heresies" such as Docetism--inexplicable on the basis of traditional notions of an historical "Jesus of Nazareth"--now becomes understandable if "Christianity" developed (and continues to develop) as the intertwining of threads of religious tradition into braids of tradition that change as time goes on. "