Originally Posted by
Kromoh
The universe is the system. It doesn't matter if the universe has no cause, for it is not included in the concept of determinism that the system must have a cause. However, all things inside the system have a cause, which classifies the universe as being deterministic.
Causality is not guilt, or action, or reason. Causality is a natural and compulsory progression of a given system based on the state of the system in a given moment, said that such progression involves no randomness nor influence of things outside of the system. Causality is true for the universe -- aka the universe is deterministic.
If it is eventually found that there is something greater than the universe that influences it (which I will name megaverse), then the universe will not longer be the system, but a subsystem, and the megaverse will be the system. This is all only a hypothesis though, to show that determinism is true for the universe, whether the universe has a cause or not.