To me, the Universe shouts God's glory, but it certainly doesn't prove His existence (by His choice I would contend).
It may not "prove" his existence, but it's not like God is trying to trick people into believing He does not exist with His creation either. "Prove" is ultimately a relevant term depending on who is having something "proven" to, but regardless, the universe is always and forever fully consistent and supporting of the idea of His existence.
On the first part of your post, I think you underestimate my openness to the idea that universe began from "nothing" if one counts information and energy without matter as nothing. I view matter as somewhat illusory in the sense of more having to do with intersecting energy patterns than something standing all on it's own.
In terms of a beginning, I view the beginning ultimately as a Person.
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