The judeo-christian god and the muslim god alike were the amalgam several gods that existed before it. If you look at the mythologies within christianity, judaism, and islam you will find elements from previous religions and mythologies. Monotheism itself comes from a period in Egyptian history when a single pharaoh eradicated all of the egyptian gods and forced worshipping a single god upon his kingdom. This was subsequently undone after his death, but it had not been done before then.
"In our youth, we lacked the maturity, the decency to create gods better than ourselves so that we might have something to aspire to. Instead we are left with a host of deities who were violent, narcissistic, vengeful bullies who reflected our own values. Our gods could have been anything we could imagine, and all we were capable of manifesting were gods who shared the worst of our natures."-Me
"Atheism leaves a man to sense, to philosophy, to natural piety, to laws, to reputation; all of which may be guides to an outward moral virtue, even if religion vanished; but religious superstition dismounts all these and erects an absolute monarchy in the minds of men." – Francis Bacon
"Atheism leaves a man to sense, to philosophy, to natural piety, to laws, to reputation; all of which may be guides to an outward moral virtue, even if religion vanished; but religious superstition dismounts all these and erects an absolute monarchy in the minds of men." – Francis Bacon