Judaism is more than a religion. It is a culture, a civilization, and somewhat a group sharing a common ancestry/history (ignoring converts who are not really Jews). Many Jews believe that even if a Jew leaves Judaism, he/she is still an ethnic Jew.
A convert or a proselyte.
For many people, there was no alternative but the Church in which they were raised.
It allowed people to received new media
Could be. People change their last names, you know. A Jewish person could have anything for a surname.
Well, when people from other religions pass it down, some people just change the rules in basketball.
Cell phones allowed people to be in constant contact.
In many countries there was no significant change for Jews in 1940. In Poland however there was change: In the German occupied sectors Jews would be placed in ghettos and in the Soviet occupied sector the warm reception that Jews recieved would chill.
Well, you see, there was a significant lack of Jewish people when the war was through.
Humanism really promoted education and the free exchange of ideas
Many have taken elements of newer religions of the people who have immigrated to their land.
No one has special insight into how the future will change people and the religions than they follow.
they allowed people to be in constant contact