Is,it true that Jews believe Christian want to kill them? I heard on the radio that one Jew mentioned it that way. ..?

There are many Christians who are good people.

And indeed there were Christian heroes who sacrificed themselves during the anti-Jewish persecutions.

But there have also been a substantial number of Christian institutions among whose goals was either to kill Jews (Crusader orders, followers of Martin Luther, followers of Chmelnitzki, Black Hundreds ...)

or to force Jews into conversion and/or kill Jewish culture (a great variety of Christian institutions from the Inquisition to "Jews for Jesus")

Note - insisting on Christian readings of Hebrew scriptures (as you do in your reference to Isaiah) while talking to Jews is often part of a theological mindset and starting point key phrasing of the anti-Jewish institutions within Christendom.

Either you or your grandfather is lying. Christians have a 2,000 year history of murdering Jews. Hitler sent ATHEISTS to concentration camps, because they were necessarily taken for communists, with the Jews, not Christians. Hitler was a Christian.

The Jews will simply claim that you killed a bunch of them with no evidence to back it up.

They did it about 70 years ago.

Every religion thinks that every other religion is their mortal enemy...and they ALL utterly despise Secular Humanists for embracing all of humanity..