There’s a lot of evidence, a lot of compelling evidence that shows that the universe in its present form or any previous form could not have existed from eternity past, or from infinity past. Our universe points to a beginning, a singularity, a definitive space / time boundary, a Big Bang Creation Event. So clearly does our mathematically precise universe point to a finite beginning that any of the dozens of alternative theories (meant to do away with a beginning) simply can't refute the evidence. Every theory so far proposed also requires a definitive space / time boundary and thus fails in its attempt to do away with the need for a Cause, a Cause that existed outside of and prior to the creation of space, time and matter.
This evidence just ricochets off of atheist brains like bullets bouncing off of Superman's chest. You can present this evidence to a single atheist a thousand times (I think I’m close to that marker) and it doesn’t even make a dent. Nothing. They’ll just ask over and over and over, “But why can’t matter have existed forever?” Talking to atheists about this is almost as amusing as noticing that while bullets bounce off of Superman, he ducks and weaves to avoid being hit by a gun that's been thrown at him.
Once piece of evidence that points to a finite beginning is the 2nd Law of Thermodynamics.
Atheist Astronomer Arthur Eddington:
“ The Law that entropy increases - the Second Law of Thermodynamics - holds, I think, the supreme position among the laws of Nature. If someone points out to you that your pet theory of the universe is in disagreement with Maxwell’s equations - then so much for Maxwell’s equations. If it is found to be contradicted by observation - well, these experiments do bungle things sometimes. But if your theory is found to be against the Second Law of Thermodynamics I can give you no hope; there is nothing for it but to collapse in deepest humiliation.”
Ah, me. Because the only antidote to a Supernatural Cause for the beginning of the universe is matter existing from infinity, well, atheists know no such humiliation. They just repeat the mantra, "Matter must be eternal. Matter must be eternal." Anything, even space aliens is a more acceptable idea to atheists than the universe requiring a Supernatural Cause for its beginning.
Nevertheless, a beginning IS what the universe had and that beginning requires a Cause. It requires a Cause that existed outside of and prior to matter, space and time and the laws of physics.
The beauty of the second law is that it’s so simple for average people like me to understand. The Second Law of Thermodynamics is also called the Law of Entropy which is a way of saying that nature tends to bring things from order to disorder. Obviously, if we are moving from order to disorder, and if the universe was infinitely old, the universe would already be dead and in complete disorder and complete decay. The universe would be cold and dark. Science knows that we’re moving in that direction but it also knows that we’re a long, long, very long way from the end. Atheist Astronomer Robert Jastrow compares our universe to a wind-up clock. "The fact that it’s winding down proves that at some point, someone wound it up."
Our universe is like a vehicle that began with a full tank of gas / energy. While you’re driving around the energy is simply being converted to another form of matter. However, the very fact that you’re still driving around shows that your journey began a finite time ago - otherwise you’d be out of fuel. As with a flashlight, the lights in the universe were not turned on an infinite amount of time ago. They are still glowing strong and clear signalling to us, that while it’s obvious Someone flipped the switch, He did it just a relatively short time ago.