And it just seems like limiting G-d to me. This is going to sound flakey, but it seems to me that having a system of morals and ethics is almost the voice of G-d within you, proof that you hold part of divinity within yourself.

There's more, here, but to be honest I don't think the whole "there are no morals without G-d" isn't so much intended as actual theology so much as a rationale for why governments should legislate a single official religion.