Jews have not been engaged in religious conflict since the Bar Kochba Revolts. Jews have been involved in numerous non-religious conflicts in predominantly Jewish Units in both World Wars and in Israel, but these conflicts were based on strategic and political goals. (To have a religious conflict requires one party to wish to impose a religious belief on a different party such as the Thirty Years War or the Islamic Conquest of Iberia.)
Since Jews have not been party to religious conflicts, it is impossible to say what caused them to involve themselves in such things.
Why did the Jews fight whom?
The Jews have had to fight numerous adversaries throughout their 3,000+ year history. Typically Jews fought in self-defense, in the defense of their property, in defense of their countries (when they had them), in defense of non-Jewish countries (when they were permitted to bear arms), and in defense of their faith and practices. For anything with more clarity, an adversary should be specified.
No, they did not fight for the Jews.
There's a misunderstanding here. The Allies did not 'fight for the Jews' and they did nothing targeted specifically at ending the Holocaust.
No. America fought in WW2, one result of WW2 was to free those Jews who had not already been killed, but the USA did not fight in a war to free Jews.
Have a look at the related question.
You need to give a timespan and region.
the Jews
Fight World War 2.
No. Hitler did not fight the Jews for any Islamic reasons. However, he had no issues or problems with bringing Muslims into the SS divisions to help promulgate the Holocaust.
Let out? Do you mean after America liberated the Jews? Jews didn't fight back afterwards in the masses or anything. I'm sure some of them attacked soldiers to try to get revenge, but nothing substantial. l But if you mean during the war, yes. Some tried to fight back at least. But Jews also knew that if they tried to they would be killed imediately.
Jews.
Other countries fight with Jews because they are not like the Nazis and the other countries don't discriminate people but some countries still disseminate people because of their race and/or religion and/or their sexuality
Their very survival. What else do you fight over when you have madmen that are not remotely afraid of admitting to the world that they want to kill all jews?