[Silentio]

I don't think so. I do think there is a problem when we view other cultures from the outside, and when we focus only on the "fancy" aspects of culture because it's more interesting than how people arrange their bedding, or whatever.

However, I think you are focusing too much on religion as ritual specifically. Yes, indigenous Americans, for example, have certain rituals, rites, and special events that stand apart as specific expressions of their unique culture. If those rituals seek to connect the individuals who participate in them, and the community as a whole to an "ultimate reality" or an unseen world, we in the west call it a religious ritual. Most indigenous American people (all, as far as a I know) do not even have a word for "religion," however, so the mundane and the "fancy rain dance" are each simply forms of culture with no defining boundary.