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(About Germany killing a lot of its own ppl, well I allways thought it was befourse H had an issue with Judish ppl - and judish ppl are ppl who belive in judish; so that was in a name of an god)

Don't fall into that trap.  Jewish people are an ethnicity with a religion.  Whatever Hitler thought of their beliefs, it was the people themselves he did not like.  (There were a few other groups he didn't like much either.)

The spread of Christianity marked a bit of a turning point as it is one of the first major religions that was not exclusive to people of one tribe or nation-state, instead inviting people of all races and nations to accept common tenets of faith. 

That the Jewish people would always be Jewish regardless of national identity has caused many people throughout history to questions their patriotism and loyalty, as if their Jewish identity made it impossible for them to truly be citizens of any country (except Israel).  Similarly, many Americans expressed concern about John F. Kennedy running for president because they worried that, as a Roman Catholic, his loyalty would be to the Pope and Rome, rather than upholding the constitution of the United States.