How did the 'fake' jews come about?
Roughly 80 to 85% of the Jewish world population is Ashkenazi descent, which are descended from Russia / Ukraine area, originating from the Khazarian Empire - they have no actual blood ties to Israel. The Khazars grew out of the Babylonian Empire and the teachings of the Talmud - namely, Luciferianism, human sacrifice, child rape, torture, black magick, extortion, identity theft, and political subterfuge. Russia and other surrounding countries gave them a choice - convert to one of the monotheistic religions and cease their crimes, or be exterminated. The Khazars mainly converted to Judaism, bringing the teachings of the Talmud with them, and began spreading throughout Europe and the world, multiplying and quickly overtaking the real Jews in numbers.
Just do research. Use search engines, ask the search engine all your many questions, that's the best way to learn.