Indeed you are a hero by virtue of your ancestors who bravely eschewed and wisely abandoned their spiritual identity when it became dangerous that you might adopt it generations later for purposes relating to your deep faith and knowlege. You should be proud of your Jewish (paternal) heritage and true spiritual identity as a Lutheran Jew, better yet, one on your father’s side! I applaud you as do all Jews who did the right thing - like Luther, Torquemada, etc. did - in the fire of Europe, That’s for sure! As a Jew don’t forget to say yahrtzeit for your surely grateful patrimony, remember the evangelical, paternal roots of your blood-faith Judaism, and congratulations!
I do! I will! :)