Literally, when everybody stops working and rich patrons of the city would pay for banquets. There's all sorts of religions. It's incredibly rich. It's not unlike twentieth century America. You have low-tech religions, like magic.
People routinely go to magicians.
If you have a sinus infection. If you need somebody to fall in love with you. We have magic books that are books of recipes, and they're indexed and you can look up what you need, and the professional will help you. It's a spiritual universe that's thickly populated with gods and spirits. Paganism is the rich native religious stew of traditional society in the Mediterranean.