think of this, Christianity started in England in about say 250 AD, If you are a Christian today in England you have nothing in common with any of the previous generations of Christians who lived in England from 250 onwards. Except faith in Christ. The language has changed, morphed, transformed, even in our generation its changing, the clothes worn today were not even worn the same a hundred ago. Every Generation of Christians even within a country are in fact a new nation, different in every way. When you get to heaven and you say, that guy over there is from England, you have to say from what century because the name England itself would be meaningless to the roman English Christians or the angle Saxons or Vikings or the middle ages or whatever. The first Americans have nothing in common with you other then a geographic location name. God is saving not only cultures but timestamped cultures. or think of this, if there are say 500 cultures on earth today, theres probably thousands, there might be tens of thousands of cultures in heaven.