That person was not well versed in the teachings of Islam. The “people of the book” (Jews and Christians) have the same god as Muslims. A studious Muslim would still probably say however that people of any other religion or non-religion are infidels.
“Thou shalt not have no other god’s before me”
One thing worth noting here is the absence of any insistence on monotheism here. God does not declare that he is the only god in existence; on the contrary, the words presume the existence of other gods and insist that they should not be worshipped.
That was the point I was trying to get across. In principle it is the same god, “received” in a slightly different way.
Like a giant rubic’s cube, one person says “I have seen god and good is green, the second says “I have seen god and god is blue, etc. Thus instead of saying we have all seen the rubic’s cube, untold millions have died because of color selection. A nice excuse to act against people who have a god (bird) of a different feather.