Throughout the history of Judaism, Jews have gone through centuries of persectution, but many Jewish communities still have faith it what they believe in. The begining of Judaism can be identified sometime between 539-333 BCE. During this time the Persian Empire was dominant. And it was in this period that Judaism consolidated as a religion based on the Bible.
Today there are approximatly 13 million Jews in the world, about 6 million in the USA, 3 million in Isreal and the rest scatered across the globe, many located in Russia and E. Europe. Many Jewish families attend a synagogue, a place of gathering and worship. Although they may be members, it doesn't mean that they attend every week.
The worst and most deadly of the anti-Jewish movements was duing the late 1930's and early 1940's, when nearly 6 million Jews where "eliminated," simply because they where Jewish. This was the worst blow to Judaism in its history. In the unethical "destruction" of the Jewish community 1/3 of the Jewish people in the world were killed. This, the Holocast, and the pathetic role played by most goverments, is the central fact in all relations between Jews and non-Jews today.