Yeah, I think this describes how we differ. It accounts for why I'm a Christian and you're an atheist (or agnostic? I can't remember).

The problem with not invoking ethics (or, really, ontology to bring it even farther back) is you can't ever find a complete answer to any question. With no fixed point of reference, there is no truth. In practice, we don't need to invoke ontology to have a conversation, because we have a functional shared worldview. The irony is that in order for atheists to argue at all they have to adopt a Christian ontology (or at least an ontology that accounts for transcendent reality). Without base reality, all propositions are relative, in infinite regress.