Excuse me, but there's another religious point of view on this, plus you are dead wrong on the history of the Jews.
First of all, the Torah is VERY explicit that G-d will NEVER abandon the Jews. However, just as a child is punished by a loving parent for misbehaving (this is known as tough love), so can the children of G-d be punished for the same reason. G-d, through Moses in the Book of Deuteronomy, was very explicit about this, and also about NEVER abandoning the covenant that He made with Abraham, Isaac and Jacob regarding their descendants. Before the 2nd Temple fell, as was the case with the 1st, many Jews ceased to obey G-d's Law (or began to worship other "gods"), and as a result He removed His protection from the Jews and allowed them to be subject to the normal forces of history. Being a small nation, and a fractured one at that, in both cases the nation fell to more numerous/powerful opponents. However, G-d was very explicit in promising to never let the Jews be completely destroyed, and in promising that eventually, when the Jewish people repented and began to once again observe His laws as put forth in the Torah, that they would be redeemed and rewarded.
As to the nonsense about the victims of the Nazis not being Jews, it is just that - NONSENSE! Many, many Jews fled the destruction of the 2nd Temple to Egypt, to Italy and to Spain. Many also went to the then large Jewish communities in and around what is now Iraq (i.e. the place where the Jews were exiled to after the destruction of the 1st Temple, and from which many of their descendants never left). Many of these refugees, who indeed DID retain their religious character, later moved to France, then to Germany, then to Poland and to Russia. Most of these moves were less than voluntary - they were a matter of simple survival, as crusaders and debtors of the Jews found it far more convenient to either murder or exile the Jews than to have them stay around.
Undoubtedly, SOME Jews fled to the Black Sea region, and undoubtedly some of them intermarried and lost their heritage (as has been the case with all to many Jews in almost every land in almost every era), but a remnant remains - and always will, since G-d promises such in Deuteronomy.
Kublia Khan, you are SERIOUSLY misinformed, both about religion and about history. Go read a few books, including a Jewish version of the Bible. Maybe you'll learn something.
Amen.