My bad. I don't know how I have used "cause" incoherently, as you seem to imply, but:
Per Google:
"cause
/kôz/
noun 1.a person or thing that gives rise to an action, phenomenon, or condition.
"the cause of the accident is not clear
Similar:
source, root, origin, beginning(s), starting point, seed"
Also per Google:
"First Cause
noun
PHILOSOPHY
- a supposed ultimate cause of all events, which does not itself have a cause, identified with God."
I do not hold exactly to Google's definition of First Cause, unless by "all events" is implied "all effects", whether immediate or subsequent ("by proxy" so to speak). (To me all effects are not only subsequent but immediate to First Cause, but that is another discussion)..
As far as I know, the logical principle of Cause-and-Effect rules all considerations right back to First Cause. I have seen no reason to believe otherwise. If you can show me how it can be otherwise, we can discuss that, though I have already done so ad infinitum. Maybe you can show me where I went incoherent or even incogent.