It is not possible for man to create something out of nothing. So their "argument" is correct — as far as it goes. But the argument has no necessary application to God. I gather Jains and Buddhists do not see this.
They reject creation out of nothing — but then the supreme achievement of their eschatology is the attainment of the state of "nothing" — of personal oblivion, the total annihilation of ego identity, the merging of self with Self....
Question: Does this make "Self" a sort-of "nothing," too?
I confess I can't figure out this stuff. :^) But I do note that the natural sciences did not rise in the East, but only in the Western cultural context, preeminently informed by Christianity and certain ancient Greek philosophers....
Thank you so very much, Cronos, for your fine synopsis of the main currents of Eastern religious belief!