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Thank you so much for your reply, dear albionin!

I must however disagree that "God did it" alone halts the investigation. Either "God did it" or "Nature did it" is a cop-out. It is enough to say that a question cannot be answered by the scientific method at this time, e.g. "why this instead of something else or nothing at all?"

You can’t have an infinite regress of causes, that’s the first cause argument.

Steady state physical cosmologies were debunked when the CMB measurements beginning in the 1960's and accumulating forward since, all show there was a beginning of real space and real time. In other words, space/time does not pre-exist but is created as the universe expands.

It was the most theological statement ever to come out of modern science (Jastrow.) Scripture begins, "In the beginning, God created..."

With the notable exception of Tegmark's theory, all other physical cosmologies known to me (multi-verse, multi-world, ekpyrotic, cyclic, imaginary time) all lead to the infinite regress with the presupposition that prior universes have the same physical laws/constants as this one.

an inquiry into the origins of anything can not go outside of existence (nature) to look because there is by definition nothing there.

To the contrary, that is a philosophical presupposition not a scientific one.

The only closed physical cosmology known to me, Max Tegmark's Level IV Parallel Universe, posits that 4D space/time is a manifestation of mathematical structures which actually do exist outside of space and time.

Newer Geometric Physics theories also illuminate physical cosmologies, e.g. f-Theory (Vafa), 5D2T (Wesson.) Both of these theories call for additional dimensions of time. Vafa's continues the compactification (string theory) model of Kaluza/Klein whereas Wesson's is a higher dimensional dynamic.