The contingency of the world is fourfold. First, the laws of physics
themselves appear to be contingent. Second, the cosmological initial
conditions could have been otherwise. Third, we know from quantum
mechanics that “God plays dice” - i.e., there is a fundamental statistical
element in nature. Finally, there is the fact that the universe exists.
After all, however comprehensive our theories of the universe may be,
there is no obligation for the world actually to instantiate that
theory….In my own mind, I have no doubts at all that the arguments for a
necessary world are far shakier than the arguments for a necessary being…

The Mind of God by Paul Davies.