Can someone please explain exactly what, if anything, this term means? I've been having a debate on Sodahead with a theist (and a troll as well) who keeps on making the claim that if there was no god, there could be no 'ontological grounding' for objective morality. I do not really know how to respond to that because it doesn't even make sense to me. I do believe in objective morality, but whether or not a god exists has nothing whatsoever to do with that so far as I can tell.
Is he simply misusing the word 'ontology' to try and throw me off, or am I missing something here?