[edmcnulty101]

'invisible man in the sky'

It's useful because it's an abstract term that can apply to the majority of religions.

No need to label God or Allah or Shiva or Jehova or Zeus or whatever.

Saying 'higher power' or 'cosmic force' is not descriptive as there's also include things people don't worship like astronomy.

Almost all monotheistic organized religions have worshipped an invisible man in the sky and most poly theistic as well.