There is nothing in the world that observably comes from nothing so for you to even entertain the idea is ridiculous and inconsistent with your pretenses of being rational and scientific minded.
You have such an aversion to God that you will believe in anything that can remove you from confessing The Truth. Not too long ago you were trying to tell me that the universe didn't have a beginning, and you had no problem believing that.
See, it's not that you don't know. You know that God doesn't exist, so you will tumble around and do mad mental gymnastics to avoid abandoning this position.
You should give up. The burden is light. The yoke is easy. You are making this so much harder on yourself than you have to.
There is nothing more certain than the existence of God. Believe it. Confess it. Stop doing this to yourself.
What can be more certain than The Ultimate Reality's existence? It is a surety.