Regarding the evidence about God.

Hello.
This morning I spoke with a wise man, and briefly presented to him the cosmological view and the theological physics. (He was familiar with them)
Regarding cosmology:
(Sorry for the imperfect wording.)
I told him this: In our world, which is a world of matter, everything has a prior cause, and therefore the world and the primary matter must have a prior cause, and therefore in order not to enter into a regression of infinite causes, it is reasonable to assume that there is a cause that does not need a cause and is not matter and therefore does not need a cause.
He pressed twice:
A. What is the problem with regression? What is problematic about this answer?
on. We only know matter. Therefore, to say something that is not matter is like saying "something that is not something." In other words, I didn't define anything. And when I tried to tell him that it "exists," he asked me in what respect does it exist? We only know physical, material existence.
 
We also talked about the physico-theological view:
I told him that I had evidence from the laws of nature that they work and that natural selection is created by their power with orderly results until we get something wonderful and orderly like man. And since that is the case, it makes sense to ask how the laws are so suitable that if you throw plasticine into them, after billions of years an entire zoo emerges. In other words, the laws could have been a million other options that produce nothing.
He made it difficult:
He claimed to me that the fact that I see an orderly result is an illusion.
Because if I had many examples of universes with other laws that have nothing in them, there would be something to talk about, but when I only have one example, then even if a world with other laws were created, perhaps completely different creatures or things would be created, which I would also consider to be ordered. He pressed: Who determined that it was ordered?
In other words: How do you evaluate and define that something is orderly when these are the only rules you know?
 
Thank you very much.