Omnipotence and omniscience have always been the main principles of God, I don't know how you are just now discovering this... And it's easy to dismiss it, because you grew up on, live, and operate under the laws of nature. What seems impossible to you can be thrown away easily, but if you reflect on the possibility of a being being capable of not falling within the rules of our lives, then you realize that it isn't an unsound belief. It explains how something indeed come from nothing, since nothing and something are principles of the laws of nature that we live under.