Nope, they didn't vanish, they became your family tree, dude. Like, your ancestors.
Why do you want that so much? Are you a mixed Jew?
But I'm sorry to disappoint you, most Germans, most Europeans have no jewish ancestors! Their numbers were always just to few and the political environment was seldom friendly or accepting to intermingling, they were most of the time isolated, hated and mistrustet...that is a fact!
There were of course always those Jews who gave up their religion in exchange for a chance of a better life or unable to resist the pressure on them any longer but as I said before - they assimilated into their host nation, to become German, French or Polish, not Jews anymore!
Your family must have been catholic at some point since you are Euro.
Well...my family must have been pagan at one point since I'm Euro!