The burden of proof is not on me, it's on you. This is a well-established theory with a strong consensus in the scientific community so the burden of proof would naturally fall on anyone trying to refute it.
The second law of thermodynamics states that in any closed system, the total entropy (a measurement of disorder) always increase over time. It implies that energy spontaneously tends to spread out and become more disordered, making a natural progression of order to disorder in the universe.
Over time, the total entropy of the universe increases. If matter and energy would have existed for an infinite amount of time, the entropy would already have reached it's maximum possible value and we would have reached a state known as heat death. Since we observe that there is still order and usable energy in the universe, it suggests that everything had a beginning.
This doesn't mean that there has to be a God that created everything, but the universe certainly had a starting point. Whatever caused the big bang, we don't know but we do know that the universe is finite.
If matter and energy really had always existed, we would have had no usuable energy left according to the second law of thermodynamics, hence it must have had a beginning.
So while the so called clowns who dreamt him up didn't understand thermodynamics, you clearly don't either.
