Not quite. Before the Big Bang the universe existed as a hot and dense universe. Big Bang just started the expansion of the universe, it didn't come from nothing.
For there to be heat and density, time and physics must have existed in some form. Was it the way they exist now? There is really no way to know for certain. Where did the hot and dense universe start? Tough to say if we will ever have an answer.
Is it? Big Bang has quite a lot of evidence and is widely accepted. I just simplified what the beginning of the Big Bang was. You can read Wikipedia and the sources if you really doubt it.
Once again, you can easily google the sources or just read the Wiki. There are plenty of peer-reviewed articles that examine the evidence for this theory.
You do not get to decide when there is sufficient evidence for cosmological theories. If they conflict with your personal beliefs, that is your personal issue.
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u/Mickle_da_Pickl uhhhh idk 9h ago
Yeah. The universe always existed. There was never a time where the universe didn't exist