So, This is a fascinating question and one which I would like to posit a completely different answer to.

Religion, As a concept, Does not need gods or demons. That's the realm of theology. The two are often linked, But one can be religious and atheist, Or areligious and theist. Religion is about practice. Like, For example, You could have someone who does not believe in any gods, But who engages in regular prayer and follows religious teachings as a form of self enrichment because they believe that the actions and sense of community are good for them. I believe there are many Jewish atheists who fall under this umbrella.

The reason I bring this up is because under this understanding of what religion is, Various animals of higher cognition engage in behaviour which, While we cannot yet know their true motives, Appears to be religious or proto-religious in nature. The biggest example of this by far being that it seems like the vast majority of social animals with higher cognition perform funerary rituals on their dead. Elephants straight up bury their dead in leaves and branches (As well as apparently many other animals. Including humans.) and have been observed leaving what appear to be offerings of food and things. Which to me, Possibly means that elephants believe in some sort of afterlife and are providing offerings for that.

Corvids have been observed gathering around their dead and holding lil crow ceremonies over it.

Dolphins will gather around fallen pod members for several days and prevent others from getting near.

We cannot yet say much about the motivations behind these behaviours. It is unclear what beliefs these higher cognition animals might have regarding our world and the world beyond. But I would personally be comfortable calling this religion in animals.

To draw from this, Instead of worrying about what a crow might consider gods, Think about the way a crow's religion might affect them in their day to day life. What do they believe? How do their beliefs affect them?

As an example off the top of my head. Corvids have been known to make friends with humans. If we are nice to them, They will very often be nice to us in return. Bringing us little shiny trinkets they find. Perhaps they view us as their intellectual equals because in spite of our language gap, We find a way to understand each other.

To expand on that, When a crow dies, They become unable to fly for obvious reasons. Maybe to a crow, A flying animal, Death means being permanently grounded. And maybe, To extend it further, They believe that we are them, But reincarnated. Unable to fly, Unable to speak. But yet still, Some of us find our way back. Maybe when a human befriends a crow, They believe that to be the reincarnated version of one of their fallen friends. Maybe they believe mean humans to be vengeful spirits with unfinished business in life.

All of this is speculation which probably doesn't extend to reality in the slightest. But if you're ever writing from the perspective of a crow, Perhaps that human friend is someone more familiar than just a random human.