Perhaps Saint Paul was merely an early marketer. One who quickly realized that trying to sell it to the Jews was not working, and would not work, but ending all of the limitations of Biblical Law, especially on eating, clothes, farming techniques, would open up an enormous market for the idea. It also made him the main proponent of this new religion, not a bad job, as things go. Perhaps a bit cynical, my view, not yours, but having read Eric Hoffer’s the True Believer, Paul seems more at home in those clothes, than as a true convert.