You still do not seem to get it. Of course God could have created M-branes to produce the universe, but God did not. How do we know this? There is no evidence that the universe was created this way. There is strong evidence that God created a singularity to do this.
The problem seems to be that some scientists do not want to accept this evidence. Also everything that is physical, which includes matter, energy, time, and space, has a beginning and ending. God is not physical, which means that God has no beginning and ending. It also means that there is no place for God in science, which is okay because God is beyond science. God is the Source the universe and the Source of science. God is not the universe and is not science.
God did do it in an unknowable way, since God created something out of nothing, no matter, no energy, no space, no time. That is a fact even though that goes beyond our experience and thus our understanding, which does not mean it cannot be…
On the other hand humans do understand what a beginning is and how creativity can bring something new into the world. Babies are born every day. Inventions come into existence every day.
Creation is not an outlandish process. It is making something using one’s mind. If the universe was not created by God using God’s mind, there is no doubt that humans could not understand it using their minds. “The most unintelligible aspect of the universe is that it is intelligible.” Albert Einstein.