Let’s define “God†as the “supernatural being who created the Universe.†That is, God is the cosmological singularity. To see this, unpack the definition of “God.†The word “supernatural†literally means “above nature,†or outside of space and time, and not subject to the laws of physics…the cosmological singularity is the cause of everything that exists, but is itself uncaused.
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Looks like an argument for a Deist God, which a lot of religious people don’t like.
I am desperately grading final papers this morning and can't get into this :-( but I would remind the faithful of Hebrews 11:6, "And without faith it is impossible to please him, for whoever would draw near to God must believe that he exists and that he rewards those who seek him." (ESV)
One can demonstrate that God as "the cosmological singularity" probably exists; one cannot prove beyond doubt that God exists, because that would require experiencing God at God's level, which by definition is impossible--Diana Ross got to have two Supremes, while the rest of the universe only gets one, and so our experience of that One would always be at less than a Supreme level.
The essence of the gospel, however, is not that God exists, but that God's nature is such as to desire relationship with us, as individuals and as a unit (the church). It is that second assertion, that God "rewards those who seek Him," that cannot be proven nor presumed, only hoped for and experienced.