I don't understand your point. What they did do was ok and not at all relevant to the current topic? The Crusades lasted a couple of centuries and killed in the name of God. Women and children were killed. It was primarily fought against Muslims. If they didn't go to the same extremes as modern day Muslims (again, the radical extreme ones), everything else about them looks the same.
I agree whole heartedly about religion though. If someone wants it - go have it. Leave the rest of us alone.
Here is someone's view and time line if Islam's expansion.
Timeline of the Islamic Crusades
Note, the Christian crusades were launched to recapture the land from the Muslims. And let's not forget that the middle ages opened up in Europe to the Renaissance. And the Inquisition pushed not only the Jews out of Spain, but also the Muslims. And that happened in 1492.
And then we have the battle of Vienna and Lepanto
Battle of Lepanto - Ottoman Empire Defeated at the Battle of Lepanto
Battle of Vienna - Timeline Index