So it's a cylical universe extending back infinitely, or, it's a supranatural entity standing outside the order of things.
Neither seems particularly plausible so I'll hold out for another option.
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"testimonial evidence"
I'm not impressed by anecdotes, especially from folks I don't know, and haven't met.
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"Why is there something rather than nothing?" (which presupposes the corollary, "Nothing comes from nothing.")
Hell if I know...
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"If God is the ground of all that exists (the usual definition of "God") "he" is absolutely not something measurable."
Mebbe so, but if he wants my attention he'll have to do more, be more, than a 'conclusion'.
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"Since God is the ground of everything that exists, all of said existence is the evidence."
A conclusion arrived at cuz there seems to be (for some) no better explanation for why reality exists. Well and good for those folks, but my head isn't built that way. As I say: I'll hold out for another option.