Dearest Heart... I'm sorry.. But are you being serious? Have you any idea how many Christians are persecuted in countries around the world by muslims?
You mention the crusades? Do you know why the crusades happened? Although as a Christian I would be the first to condemn what was done in the long distant past in the name of God. I know for sure it would not have been pleasing to God that such atrocities were done in His name. Modern day Christians actually apologised for the crusades.. Publicly.. I'm sure if you googled it you would see... I believe they walked the route taken..
as as you have brought this up may I ask you.. Do you as a Muslim feel the need to apologise to the Christians that have been persecuted and killed in the name of Allah? When a Muslim takes an innocent life do you feel shame?
Its to very sad that you raise this point, and it shows how little you know about Christianity and Christians. Do you not see that bad people exist in all religions .. They kill and maim.. And at times say they do so in Gods name.. Or allah's name.. Are they right to do so? I know Christianity does not condone violence against others Jesus was clear in His teachings. can you say the same about Islam and the prophet of Islam? If so.. Then the point you have sought to make here is not valid.
Peace