Religion in Kettos
There is no formal/overarching church in Kettos, not even in the Empire. However the dominant religious philosophy among Humans is that of the Temple of the Five and the One. There are ten Gods in the Human pantheon, the goods of good: Bahamut, Kord, Pelor, Erathis, and Ioun and their counterparts the gods of evil: Tiamat, Bane, Torog, Asmodeus, Vecna, Bane, Torog . The gods of evil and chaos are not worshiped, though their presence is acknowledged, and even worship not explicitly forbidden by the Temple – though they raise no shrines to them. No god is supreme over the others (“The One” refers to the one-ness of the pantheon, and the one reality of the universe).
Among those who do not follow the Temple, there are countless gods – if you can find a god in the PHB (aside form the real world historic ones) you can find a shrine somewhere in Kettos devoted to them.