Where did the universe come from? Atheistic origin science has no answer.

[snowtracks]

There are several things wrong here

according to the prevailing scientific model of cosmology, the space-time-matter-energy U. had a distinct and singular beginning about 13.75 billion years ago;

No.

* Even if you ignore inflation, the resulting singularity is in a regime where classical general relativity is not valid.

* If you include inflation or any of the few alternative proposals, there is no singularity (and don't come tell me that this is unproven metaphysics - YOU are the one trying to derive theological conclusions from early cosmology)

* Even if there were a true hard starting point of the timeline of the universe, this does not mean that it "depends on something for its existence". You intuitions of cause and effect don't even hold in our universe at the fundamental level, let alone when there is no time and space in which something can happen.

* Even if all the above conclusions, which are all based on wrong premises or contain meaningless statements, were correct, this would not mean that this thing which you conclude must exist as the condition of existence, has any properties in common with what you consider a deity.

therefore it is a contingent reality (dependents upon something for it's existence, why? because it had a beginning); God is the logically necessary being that explains why all the contingent realities of the universe have existence.

That last sentence, it sounds like word salad, but I'm going to bite. You have not shown in you argument that it is anything resembling God that follows as a necessity. You have not demonstrated what a "contingent reality" is supposed to mean outside of the framework of space and time. You don't call it "cause and effect" for good reason becauae these concepts are obviously not applicable, yet your concept of contingency relies on just the same intuition gained within our world of what cause and effect are, and applies it in a realm where the intuition is even less valid.

inflation is after singulaity not before in the big bang model.
no human being has ever witness an effect without a cause.