Being cannot come from Non-being

[mordant]

There is consensus in science that the universe most probably had a beginning. If the cosmos had no beginning, then there would have had to be an infinite series of past events. However, it is impossible to traverse an actual infinite. Therefore, the universe cannot be infinitely old. Besides that, If the cosmos was infinitely old, it would have reached maximum entropy a long, long, time ago. Since it has not reached maximum entropy, it cannot be infinitely old without violating the second law of thermodynamics.

No one claims that the universe is "infinitely old"; that is a misunderstanding of the hypothesis that the universe is eternal. Which is, increasingly, the actual consensus of science. This is not an invitation to simplistically extrapolate backwards under the wrongful assumption that conditions that obtain now have always obtained. Prior the the Big Bang, time itself ceases to be a meaningful construct. If the multiverse hypothesis is correct then this universe may cyclically emerge from another universe, undergoing cyclic expansion and contraction. The basic point is that there are multiple possibilities, and deities are not necessary to explain any of them.

The cause of the universe must have been non-material because if the cause was material/natural, it would be subject to the same laws of decay as the universe. That means it would have to have had a beginning itself and you have the same problem as cycles of births and deaths of universes. So the cause of the universe’s beginning must have been supernatural, i.e. non-material or spirit—a cause outside of space-matter-time. Such a cause would not be subject to the law of decay and so would not have a beginning. That is, the cause had to be an eternal spirit.

False dichotomy. It is not a question of material vs non-material, of natural vs supernatural, being vs non being. These are all incoherent, undefined concepts in any event. They mean whatever you want them to mean. You cannot define or discuss the immaterial, the supernatural, or the non-existent as you don't have access to them and the instant you do, presto, they are material, natural, and existent. Because you posit that which you can't in any way evidence, you must locate it in a realm that can't be seen or explored and which is therefore beyond discussion of any sort.