Todays Christians generally agree that genocide is bad, that World War Two happened, that the good side won. And Jesus was not a time traveller.
Your question belies a deep ignorance about Christianity, Judaism and History generally.
Even just the fact that the Old Testament is the basis of Christianity
(expanded with the New Testament) is very strange to me since it only
talks about Jews and not Christians.
Christianity is a theological divergence from Judaism, the two religions share the same origin, that is why Christians refer to the Old Testament. It is a religious text that predates the New Testament; hence the moniker “Old” vs “New”.
Jesus was a jew because historical evidence suggests that everyone living in that time and place were jewish. There was no such thing as Christianity at that time, it did not exist. Jesus could not be Christian because he could not read a book with an account about his death because he had not died yet.
There is no credible text that indicates Jesus was a time traveller from the future who read the New Testament (an account of his own life and death), then travels back in time to fulfill the future timeline.
Jews and Christians worship the same God. The Old Testament includes ‘Genesis’ the story of creation. Where God created everything, if Christians reject the Old Testament they have to devise a new creation story.
"Back in the day", I get the feeling that they had a quite different
perspective. What has happened in recent decades?
“Back in the day” you might be referring to the holocaust.
Yes during the holocaust there were many Nazi who made manipulative and deceitful statements about Jews to turn the public against them. The purpose was to recover economically. Germany could rob a significant portion of their own population through a systematic campaign of murder and then gain power by warring and dominating other nations.
In “recent decades” people have generally come to the viewpoint that the holocaust was a human atrocity. And that murdering people due to their religious affiliation is morally reprehensible.
Maybe there is some kind of Christian branch which does have such
criticism, but if they exist, I have certainly never been able to find
Yes a Christian branch did exist with a view that Jesus was not Jewish, that branch existed in Nazi Germany. Hitler attempted to redefine Jesus as an Aryan.
During the Third Reich, German Protestant theologians, motivated by racism and tapping into traditional Christian anti-Semitism, redefined Jesus as an Aryan and Christianity as a religion at war with Judaism. The Aryan Jesus, by Susannah Heschel
There maybe quasi Christian groups that continue to follow these teachings; however that Hitler (a notorious figure) is the principle inventor of this branch of Christianity is generally repulsive to people aware of his role in the genocide of millions of innocent people.
It is unlikely then that an ahistorical, debunked, recently invented account of an Aryan Jesus would be propagated on radio.
Todays Christians are more likely to align with the prevailing view that Jesus was a jew, than the Nazi view that Jesus was an Aryan. This is because some time ago the Allied powers mobilized nearly every man across earth for a time to murder millions of Nazi’s.
Today most Christian learn in early school curriculum about WW2 (the largest theatre of war ever), and their nations role in preventing a world dominated by Hitlers ideology.