Lyric discussion by riverpigeon 

Cover art for Mornings lyrics by Portugal. The Man

I think if it is a religious reference, it makes more sense to me to interpret it more as "not believing" in creation/religion, at least not organized religion :

"the sun, it rose up from the belly of sea found its bedding up in those clouds it hung for years still, i don't believe while colors rained and poured from the cotton-bound pools in the drips those drips stained us all still, i don't believe"

I get big a "the world is awesome" vibe from this song, and the "still, I don't believe" parts make it seem like it's saying that even though there are these magnificent things in the world, but he doesn't necessarily think it was the work of a god in the traditional sense. Specifically that maybe he thinks the idea of creation makes sense but he doesn't quite buy into it.

But that's just my interpretation; it could go a lot of different ways depending on your perspective.

My Interpretation