The universe currently exists. As far back as we can see it existed. To assume at some point it did not exist but come from nothing is something outside our experience. It is easier for me to believe what I have experienced that what I have never seen.... I have no doubt you know more of the engineering than I do. What I doubt is your assertion the universe was created from nothing. It seem more of a leap to say something came from nothing than it does to say the something we see from something in a different form. The later we see all the time, the former we have never seen. Occam's Razor again.
You are wrong. Occam's razor says when something looks like nothing, smells like nothing and you are not able to touch it - so why not to say it is nothing? Why to postulate a "something"?