The *metaphysical* God will not suffice as an answer to the question of the meaning of being because by zeroing in on God as explanation one simply lands in a loop since all beings – no matter their status – are, and I hate to use this phrase, always already ‘characterised’ by being by virtue of, well, ‘being a being’. One says “this being grounds all beings” and yet one has not answered “what is being?” It is, as Horwitz nicely puts it, a ‘bluff’.
In this exact sense God is a barrier to understanding being especially if we affirm Heidegger’s stress on disclosure.