Spitzer also argued that physicists like Stephen Hawkings who posit the beginning of the universe never start from nothing--they always got some beginning state that is "something." I've read the last couple books that try to make the argument of a universe from "nothing," including Hawkings, and I think Spitzer is right. It still leaves open the question, where did that initial something--even if it's just a fluctuating gravitational state--come from?
Thomas Aquinas approaches the proof from contingency in two different ways. In the one that Spitzer focuses on, the line of causation is through time. But another way of looking at it has nothing to do with time, but rather with levels of reality. If you start with a cat, for instance, and next level might be organs, and then cells, and then molecules; protons, neutrons, elections; subatomic particles, to the very end. Finally, it seems, something is holding it all up, some causeless cause--otherwise, it's tortoises all the way down.
At any rate, leaving aside whether "proofs" for the existence of God are utterly convincing, I see no conflict between physical science and metaphysics or religion, as Fr. Robert Barron explains in the video below. That's good enough for me. I don't expect any human being to be able to explain with geometric precision the origin, meaning, or destiny of human life, whether they are Aquinas or Dawkins.