I've been recently interested in China, and I've read they work well with the Piety tree. What does Piety give that synergies with China so well? In my current game I held off on founding a religion early and instead let the nearby civ convert my cities since I could use faith to purchase monastery and cathedrals under his religion. Afterward I took his capital and converted all my cities and surrounding ones to my founded religion. It worked out well. For SPs though I only dipped into the first 3 in piety, getting temples +10% gold and 20% less faith purchases. Is there anything I am missing?