Benedictus2:
It’s not. That’s just a fun word to throw at theists. In fact, that God created the universe/multiverse yet is Himself uncaused (un-created), is extraordinarily pro-intuitive. What we have are two exigencies that are hateful contraries, as W.K. Wimsatt (I think) used to say. On the one hand we have never seen anything occur that was without some cause or other. On the other hand, we are precluded from regressing causative progression(s) to infinity.
Neither infinite past time nor infinite past succession can actually exist: it cannot be actualized. At the exact, precise moment of its (presumptive) actualization, it exactly and precisely becomes finite.
So, we are left with a real conundrum: we have the impossibility of infinite regression over there, yet and we have the actuality of causative progression over here. In actuality, everything is caused (pro-intuitive), yet an infinite regression, in actuality, is impossible (pro-intuitive). So, what are we to do? Ignore this contradiction, mutter something under our breaths, and amble on? Of course not. So, like Aquinas, we settle on the most reasonable conclusion we can make. And that is: there has to be an uncaused First Cause, i.e., an un-created Creator.
Anything else is unreasonable. If anything, it is the atheist position(s) that are counterintuitive.
God bless,
jd