Latour has only 15 Modes of Existence, though he says that the number and identity of them is provisional. Nonetheless, that notion strikes me as being roughly comparable to what I have been calling Realms of Being, of which there must be 10s of thousands so far.
How could that be, 15 or so vs. 10s of thousands? One thing that’s going goes like this. Latour, for example, has a Mode for religion (which he abbreviates as REL). I’m going to have a Realm for each distinct religion, which must number in the thousands is you count the supernatural belief system of each hunter-gatherer, nomadic, and horticultural society as a religion. If so, then it’s possible that my notion of Realms of Being is not necessarily incompatible with Latour’s notion of Modes of Existence. Perhaps many of my Realms will map onto a single one of Latour’s Modes.
Now the question for religion becomes: does each of those Realms operate according to the same “felicity conditions” (Latour’s term for the operating ‘envelope’ of a Mode)?
I don’t know. It’s a serious question, and an empirical one. An attempt to answer it will move us toward a deeper understanding of culture than we now have.