Napoleon was actually quite famous for not killing Jews. There were actually numerous debates in Rabbinic Circles as to who was the greater curse to Jews: Emperor Napoleon or Czar Alexander II of Russia. Czar Alexander II was hated by some because he created numerous pogroms and instituted Anti-Semitic policies. Napoleon was hated by some because he made it perfectly acceptable to be Jewish and therefore created conditions under which Jews would naturally assimilate and lose their unique religion and tradition.

However, most Jews, especially Liberal or Secular Jews, hold Napoleon in high esteem for his emancipation of the Jewish community and his belief that Judaism was "just a religion" and that Jews were just as human as anyone else (as opposed to demonic, which was the common view).

No. By and large, Napoleon reacted positively towards Jews and dedicated a sizable part of his domestic policy towards the Emancipation of the Jews (i.e. making them legally equal citizens to Christians). He actually spent so much effort towards emancipation that some Rabbis were afraid that he would lead to Jews leaving Judaism since the discrimination had the effect providing useful external pressure that kept the community together.

If you mean in the Holocaust it was not a matter of Christians versus Jews, but of Nazis (and their collaborators) against the Jews. The Nazis did not see this as a religious matter but as racial. In the period 1933-1945, the Nazis deprived the Jews under their control of everything, including their lives.

Perhaps, Napoleon was a close follower of the brothers Maximilian and Augustin Robespierre who were advocates of the deist theology espoused by Rousseau. He might have supported Napoleon's advocacy for Protestants, Jews and Muslims and would surely have supported his treatment of the Catholic Church in general, but would have been appalled at his acceptance of the last rites.

Napolean has no relevance in modern Jewish history, however, in the days following the French revolution of the 18th Century, Napoleon emancipated Jews from laws which restricted them to ghettos. He also expanded their rights to property, worship, and careers.