Religion

In the City State most aren't religious. They may give lip service to 'the Gods' from time to time but that is about as far as it goes. Some who seek divine grace and strive to live a righteous life serve the 'Lords of Light' but they are the minority. There is also a minority who serve one of the Demigods but believers of all types are the exception to the rule or indifference toward any form of religion.

The Pantheon

Before the Maelstrom most of the peoples of  the known world served the Pantheon. After the fall none of the Old Gods remained, at least not as they once were. Some still prayed to them but over the years the practice died out. In the current age, worship of the Old Gods has become a fringe practice. In Mugulmuir it isn't even seen as real religion. It is viewed more as primitive superstition and the takes of the Pantheon have become myths.

The Gods

As worship of the Old Gods receded, it was replaced for the most part by a sort of informal agnosticism. People make oaths "by the Gods!" or petition "Gods be with us!" but "Gods" in this context doesn't refer to specific deities. It is more of an appeal to a greater power (or powers), whatever that (or they) may be.

The Lords of Light

More specific are references to "The Lords of Light". While there aren't temples to "The Gods", priests who serve them or miracles that can reliably attributed to them there is actually evidence that these are entities who sometimes bestow blessings on mortals. Because of this, there are a few priests who have established some temples. They wear the sign of an eight pointed star the upward point of which is an arrow. Interestingly, there don't seem to be any spell casting clerics who serve the Lords of Light but Paladins seem to derive their powers from them. In Murgulmuir there is a lavish temple of white marble in the Inner Wheel and a considerably more humble temple in the Sprawl.

Demigods 

Over the course of the last few centuries, mortals have become aware of more and more beings of divine power. These "New Gods" differ from the old in a few important ways.

• They don't reside on another plane of existence (the Old Gods dwelled in an otherworldly paradise). Each has a domain somewhere on the mortal plane that is impossible to reach unless the god allows it. 
• They aren't connected to one another. Each is independent and there is no new Pantheon to replace the old. Most of the interactions between them as been contentious.
• They aren't as powerful as their predecessors. In many ways their power is equivalent to that of demon lords.
• They are all at least half mad. The Old Gods were human archetypes who embodied the domain whose power they wielded. Demigods are inhuman, often alien in aspect and demeanor. Their motives are unknowable and their actions often quite brutal.

Worship of the Demigods is cult-like. It is often fanatic and secretive. People are rightfully suspicious of it.

Some of these Gods are listed HERE

Nonhumans 

The preceding assumptions are written from a human point of view but also apply to other races except as noted below: 

• Bullywug and Lizardfolk serve "the great green" (their term for nature)
  
• Dwarves practice a sort of ancestor worship 
• Eebix tend to serve the Lords of Light
• Elves and Gnomes don't believe that gods are anything but particularly powerful entities
• Gargoyles all serve the Old Gods or the Lords of Light  
• Goblins, Orcs, Kobolds and Bugbears either don't believe in anything (including an afterlife) or they worship demons
• Tritons serve the "dwellers in the deep" (ancient aberrations)

Death 

Common wisdom is that the dead go "beyond".

• Those who don't have any particular faith don't explore this question. The thinking is "Dead is gone." 
• Those who serve the Lords of Light believe that what lies "beyond" is an afterlife and that what you experience when you die depends on the disposition of your soul. Those that die in a 'state of grace' experience paradise and those whose soul is 'shadowed' will only find torment. 
• The Demigods promise all sorts of things. Some may even be true. 

No matter what you believe, what's certain is that every sentient creature has a soul and that when they die it goes - somewhere.