Sounds like the question of whether or not there is a First Cause.
Multiple Causes would be unnecessary hypotheses (Occam's Razor).
On the contrary, the branching aspect of causality (most events have multiple causes) is quite good reason to think there would be multiple causes.
And No Cause leaves the question as to how anything can happen at all (No Cause is insufficient to explain because nothing comes from nothing).
And that simply means that you want an explanation where there isn't one" only randomness. But, that is the nature of the quantum world, so the possibility of no cause is quite likely.
But it is also likely for other reasons. Causality itself is based on a time sequence and time is part of the universe. In particular, time itself cannot be caused and thereby the universe itself cannot be either.
So it would seem that a First Cause is the first best guess (hypothesis) as it both assumes the least, while at the same time providing a sufficient explanation. That doesn't mean that it is the correct assumption...
It is actually the guess with the LEAST evidence in its favor.
But to sum up: God is both sufficient and necessary to explain anything because He is the least sufficient cause to explain anything.
Really? How is that? Why does such a 'least sufficient cause' exist? What ordering are you using? How do you kn are not multiple such? Why no infinite regress?