Its not about comparison with Christianity, its about today. Today's kids will not accept history as a justification.
We can not tell kids, that its happening, because it happened before. What about deen teachings, which are taught in their elementary and middle school Islamiat books.
In my personal opinion, masses are also like children, who, if not taught and disciplined properly go wild and remain illiterate. Its the responsibility of teachers to carry a school, university, nation or ummah. Bad teachers will have bad pupils and bad community. Unfortunately thats what happened in our history. Bifurcations and sects create hate and reverse progress. Perhaps that is the reason, sectarianism is declared as shirk in Quran. 23:53, 6:159, 42:13.