Kobold Avenger
Legend
With the ideas behind that there is more nuance to Orcs, I'm going to establish that the Gruumshite religion (the pantheon of Gruumsh) is as evil and patriarchal as it's been previously described as. However other Orchish religions do exist and they tend to lean more towards neutral and good alignments. Eberron Orcs generally have 3 religions with the Druidic traditions, the Dragon Below and the Silver Flame, so following that general pattern I'm thinking of something similar outside that setting.
So much like the Druidic traditions, my first idea is the Animist religion. That's a religion very much about spirits of nature, Fey, the elements and ancestors. The religion might have a few Great Spirits who could be deities in themselves, but most of the focus should be on the lesser spirits everywhere. Perhaps as a contrast to the Gruumshite religion, the female Orcs are typically warriors while the male Orcs are more likely Shamans, spellcasters and sages. In many ways might still makes right for the Animist Orcs, but they're more isolationists instead of expansive marauders. As for dealings with the Fey, I see many of them becoming the wardens and enforcers of certain powerful Fey.
The next idea would be another Orcish pantheon but this one being more of a mix-and-match pantheon religion. It's possibly a newer one and came into existence through the interactions with other humanoid races. Many of their Gods are deities in other pantheons including Human, Elven and Dwarven pantheons but without the heads of those pantheon like Corellon or Moradin. For example they might worship Hreyr, who is Frey of the Vanir but in an Orish guise, and Sehanine Moonbow of the Elven Pantheon might have an Orcish guise as N'havala Luna in this pantheon. It's possible that one of the Gruumshite pantheon who's looking to escape the shadow of Gruumsh might be part of this pantheon too.
So much like the Druidic traditions, my first idea is the Animist religion. That's a religion very much about spirits of nature, Fey, the elements and ancestors. The religion might have a few Great Spirits who could be deities in themselves, but most of the focus should be on the lesser spirits everywhere. Perhaps as a contrast to the Gruumshite religion, the female Orcs are typically warriors while the male Orcs are more likely Shamans, spellcasters and sages. In many ways might still makes right for the Animist Orcs, but they're more isolationists instead of expansive marauders. As for dealings with the Fey, I see many of them becoming the wardens and enforcers of certain powerful Fey.
The next idea would be another Orcish pantheon but this one being more of a mix-and-match pantheon religion. It's possibly a newer one and came into existence through the interactions with other humanoid races. Many of their Gods are deities in other pantheons including Human, Elven and Dwarven pantheons but without the heads of those pantheon like Corellon or Moradin. For example they might worship Hreyr, who is Frey of the Vanir but in an Orish guise, and Sehanine Moonbow of the Elven Pantheon might have an Orcish guise as N'havala Luna in this pantheon. It's possible that one of the Gruumshite pantheon who's looking to escape the shadow of Gruumsh might be part of this pantheon too.