Islamic teaching is barbaric. so the Christian in the past. But with the time They removed that barbaric teachings from Christinism according to the modern world. but Islamic people didn't , thats the difference. Otherwise both belongs to Ibrahim religions. Basic religious concept the same. If you go back to 70s,80s, Muslims were not this much aggressive or violent. some people used their religious fundamental to turn them barbarian to activate their hidden agenda. Now Muslims are nuisance for the rest of world. whether you are not a part of hidden agendas, you can be a victim of them.
You're leaving out one crucial element to that which completely negates your entire argument. Christian scripture was completely opposed to what actual "christians" did. The scripture told them to do the exact opposite of what they did. It actually taught to love and forgive. Be kind to your enemies. If someone strikes you turn the other cheek. If people do not accept your teachings then turn around and leave them.
This is completely contrary to the teachings of Islam that actually tell muslims to kill the infidel, force their beliefs on others, kill those who turn from the teachings, allow them to use deception and even lie about their religion in countries that may be hostile to Islam etc.
So Christians in western societies imposed religion in their human judgement in order to impose "a civilized way of life" (which they learned eventually to be counter to it), not because scripture told them, and ended the subjagation a thousand years ago. Islam on the other hand actually tells muslims to commit these atrocities in the name of Allah. A thousand years later they are still stuck in mideival times.
THAT, is where your argument falls flat sir.
Christians have killed millions of people so far in the name of region. that amount cannot be compared with ISIS killings, In Medieval times: The Crusades were violent and led to atrocities by the modern world's standards under the banner of the cross and in the name of Christianity. But the Crusades were a counterattack on Islam. Muslim invasions and atrocities against Christians were on the rise in the decades before the launch of the Crusades in 1096. All current western imperialist countries are Christian. 
