Science questions

Here is a scientific question for you. The only we can absolutely know is that we experience things, changes in what we believe exists around us. If we accept that what we experience is real then we might believe in the big bang theory. That the universe appeared from nothing and existed in multiple universes (Stephen Hawking is still a douche). Here is the question, if the universe began from nothing then why couldn't it have stayed nothing? Why should anything exist including and especially the one thing that we can prove exists, us.

You could prove to me that you do not exist; but, how could anyone ever prove to themselves that they do not exist. It is the first principal of philosophy. If you accept science then it is impossible to prove that there was ever nothing. If there are material objects now then why couldn't there have always been material objects? Science says that everything came from nothing. Christianity says that God always was. Einstein said that energy could neither be created nor destroyed. I think he is a respected scientist and yet he contradicts the big bang by saying that something cannot come from nothing in a physical world.

In a world of consciousness anything can be created and destroyed. My question for any scientist that believes in the big bang is why do you believe there was a time when nothing existed and accept that energy can neither be created nor destroyed and if you don't believe those two things than do you believe Einstein was wrong? For Einstein to say what he did then energy must have a been a constant in all of his calculations.