Let's say that this is true ... what do you think happened ? If they were so advanced, why is it that today the Judeo-Christian countries are the amongst the richest and most technologically advanced ?
Dubai? China? Saudi Arabia? UAE? You think to highly of yourself, with a little less religion and alot more multiculturism, they could probably be ALOT more advanced then us. Trust me Dubai is alot nicer place then the US, or any european countries, stop looking at the pictures of places they show you on the news.
If a Jew accept Jesus as Messiah then he is Christian. That is the whole idea about Judaism that Jesus was a false prophet and that is the reason they are still Jew. Do you remember who decided to kill Jesus? In their opinion even a thief was more valuable than a false prophet.