Barbara Drossell is a professor of theoretical physics at the University of Darmstadt in Germany. In this article she talks about the origin of the universe, the fine tuning argument and the implausibility of the multiverse theory.
The fine-tuning argument is not proof. It is not science to conclude that God exists because the Universe appears to be finely tuned. But it’s a very convincing philosophical interpretation of the observation of fine-tuning. . . . If you start with the assumption that there is no God, then matter and natural laws are the ultimate reality. Therefore, it is not unnatural to conclude that there is a multiverse. It is always dangerous to attribute motives to other people, but I think some people are using it as an alternative to the God narrative. I cannot completely rule out the existence of the multiverse but I just don’t think that it is plausible. And I see no reason why we should assume it exists.