In short one can doubt one’s own existence but one can’t doubt that one is doubting one’s own doubtful existence! It’s the only one self evident truth that any sentient person can’t ever deny! The “I am” in a person cannot deny his own “I am’ness”.(disclaimer: not using “I am” phrase in the sense that God used it out of the Burning Bush)
Well, yes it is “in that same sense”.
But, not in such a way as to equate God with man’s Ego/Id. But, in the sense that it is in man’s nature to fancy himself not just A god but that each man is a god unto himself.