It's an odd question either way. Does God need a cause? Does the Big Bang need a cause?
On just cause ;), cyclical explanations create a giant hamster wheel. Why the wheel at all? So I think he implies the need for a prime mover. I.e. a force outside the system that defines the system. Kinda like axioms are needed to make maths work
Just my 2p
I demand it, really. Why should I put any stock in a god who can't explain (1) where they came from and (2) what endows them with any authority? It's a very low bar for entry.