Divine Spark is 1 Scientist or 1 Writer point per turn per district, and you need to actually build the districts. I only take it if I don't have lots of desert, tundra or jungle. And even then, I might still take goddess of the harvest or some of the other faith generator pantheons depending on the land near to me. You can do so much with Faith and the Monumentality Golden Age Dedication. Instant cheap workers, settlers and traders. Crazy expansion potential. Then you can use faith to buy great people. (great with the oracle) You can use faith to buy units in the renaissance. (tier 2 government building) You can use faith to get Apostles and generate 1 envoy with every city state, or get relics to get tourism. You can use faith to buy Natural parks. I never have enough faith to be honest. Sorry for the off topic.