With respect, this illustrates my point very well. Everything is seen through the lens of Judeo Christian belief. How could other people be loyal (or not) to a god they had never heard of?...
In Biblical point of view all modern people come from 4 couples and so all people have connection to the one God originally. At some point some of them rejected God and begun to keep other gods.
But, I believe also that in all times people have possibility to find God in some way.