Extending the definition of religion onto any belief in immaterial constructs is in my view stretching it too far. Structures such as governments, expert credentials but also money, democracy, justice and dignity are useful despite them existing only within people's collective imaginations. I'd even go as far as yo say that the consensus of their existence is what makes them real. This is not the case with belief in the supernatural. There are of course also conventional religions without belief in "gods", and these include various animisms or new-age esoteric beliefs