Completely wrong - there is absolutely no evidence which proves a beginning of the universe - the Big Bang is merely a theory; Quantum says that it did not have a begining - it's infinite. Logically it must be infinite to avoid contradiction. Just go read up on relativity and Quantum theory - none of those two can proof that it did or didn't have a beginning - again you are making unsubstantiated assumptions which shows a complete lack of knowledge of the subject at hand.
Proven? To what degree? You have to understand theories in the context of science. Evidence has told us that there was a finite begining point. What theory is it that states otherwise?
I know youve claimed this before but yet even till now, you have yet to state what theory it is.
Ive already "read up" on the theory of relatively and quantum theory, now please go ahead.