The Ownership of Science

[Jehanne]

That there is a God who created the finely tuned Universe is, and always will be, a possibility; problem is that such a proposition is an inherently untestable hypothesis, and as other naturalistic explanations (multiverse) exist, via Occam's Razor (the scientific principle of parsimony), the naturalistic models (which are testable) are to be preferred.

This is correct. None of these things will be proven for as long as humanity exists. Which is why the question is: Does anybody here have any problems with people using science to take a leap of faith and answer existential “why-s”?

You can use whatever you want; that's religious faith, its endless malleability given its inherently nonfalsifiable propositions.