Outsider's Test of Faith (OTF)

[Optimistic Mysanthrope]

And my point is that the cultural conditions can vary dramatically in various places around the world and yet people - ie. Jews and Muslims and Christians can nonetheless still have the same religion as people on the other side of the world.

You've either missed the point or are wilfully ignoring it. A vast majority of people with religious beliefs have the beliefs that were prevalent during their up-bringing.

AND the same religion as people who lived thousands of years ago in the time of Moses and Jesus and Abraham etc.

Actually, that's the subject of some debate.

How about Ham and Shem and Japheth? How about Job? How about Methuselah? How about all the monotheists who lived long before Abraham?

This too, is far from certain. There are many good reasons to think that they were polytheists, or at least henotheists.