would caveat that there aren’t powerful voices arguing that the teaching of C20th history is prejudicial to Nazi’s..
The British Empire: spreading knowledge and science to pig ignorant heathens or genocide and slavery?
WW2: a war to save the Jews or the last gasp of imperial Europe?
The Troubles: a conflict between religious extremists or the UK’s last colonial retreat?
There are still plenty of historical conflicts, and the contestedness of history is built into the subject (at higher levels). You could quite easily do the same with RE.