Which is better at determining whether the universe has a cause? From my basic understanding, quantum mechanics is generally accepted to be indeterministic whereas classical mechanics is deterministic. Posted in the philosophy question because this is related to the first premise of the Kalam cosmological argument i.e. whatever beings to exist must have a cause. The obvious answer to me seems like classical mechanics due to the fact that it operates at a macroscopic scale. But, want to see others opinion.