I've started a 3.3.4 game, using Piety early game and playing as Arabia. I have to say that Piety feels dramatically underpowered. It gives you very little in the early game that helps at all. Most policies are underpowered or totally useless (religious tolerance). Nearby civs that went Tradition were powering ahead of me - and Brazil was building up super-cities surprisingly fast. [Actually I'm really confused as to how Brazil wasn't having happiness problems give how fast it expanded and how big its cities were.] Part of my bad luck was that the other three civs on my continent also all founded their own religion and used great prophets to overwrite the religion I had spread to them, but even so there didn't seem to be much payoff from Piety. Something else weird though: triggering the Reformation policy also gave me a free Great Prophet, so I was able to enhance and reform my religion. Is that intended?? Arabia's UA also seemed underwhelming.