To that end, we can know that if the universe has a natural origin, it must have had a first cause. But if it had a supernatural origin, then it's more up in the air about whether or not there needs to be a 'first cause' (ie: an unmoved mover) to all of existence.
If all we're talking about with regard God is the "cause of the universe" then, for example, are the interactions of membranes (if brane theory is correct) to be considered God? Is the natural cause to be considered "God"?
Furthermore, any natural cause of the universe merely pushes the question back one stage... to what caused that cause.
I would also posit that the origin of the universe is, by the very nature of it, supernatural: I can not see how the cause could in any way be within what we see as the nature of the universe... the universe is believed/understood to be closed... so at best we can hypothesise about causes but we can never know.
The only possibility of a non-supernatural cause would be a natural one - i.e. self-caused (the universe being the only domain we know as nature).
I imagine that, like with all reading, the viewer must correctly interpret it. Some interpretations are right, some are wrong. But the existence of wrong interpretations doesn't negate the existence of right ones.
Indeed - and how is one to know what is the right or wrong interpretation? Coincidence that it ends up being helpful or not?
Eloquence isn't necessary for good philosophy, only nice sounding philosophy.
Eloquence is needed, as the language of philosophy is complex if one is to adequately convey one's meaning. Uneloquent language too often leads to confusion and ambiguity.
And "nice sounding" is only good for pop philosophy... the soundbite that people latch onto without necessarily understanding the context and/or meaning, but makes them sound impressive to their peer group. Or did you mean the phrase in some other sense?
Either way "Nonsense. There has to be a first cause." is merely a statement of confidence; I'm not sure Aristotle would have been quite so... reluctant to put forward his actual argument.