Judaism and Christianity have a far more violent history in sum total than does Islam.
What changed? Their holy books didn't change. Why blame the Koran for Islamic extremist violence when you won't blame the Bible for Judeo-Christian death and destruction?
Indeed -- same shit, different spot on the evolutionary path.
It's a little like, 75 years ago everybody smoked, Hollywood smoked, advertising images smoked, doctors smoked -- the rest of the world says "look, the Americans are smoking, that's cool, let's do that".
Then we find out what smoking does and we start quitting, Hollywood wipes smoking out, smoking in ads disappears, doctors say don't smoke -- then we look down our noses and say, "look, the Europeans are still smoking. What a bunch of retards.".
Yeah, let's pretend we never did that.
Oh, there's no question that great slaughter has been committed in the name of the Christian vision of the godhead, time and again and again, and to an extent which, when tallied, quite probably exceeds the head-counts that any other religion (including Islam) can boast.
But here's the thing.
Most of the violence committed by Christians was in direct contradiction to the teachings of its Founder and in contradiction to the core teachings of the New Testament.
On the other hand...
Most of the violence committed by Muslims was in direct agreement to the teachings of its Founder and in full compliance with the core teachings of the Q'uran.
Most Christian violence required a great deal of fancy footwork and juicy rationalizations to twist the minds of Believers into perceiving that they were doing the Will of God, including old favorites such as the Church doctrine of Just War - lots of spin-doctoring and reinterpretation and grasping really far into the stratosphere for a connection.
Most Muslim violence required nothing more than some tribal elder or street-corner mullah invoking the vast array of conditions under which violence or war-making may occur, along with an occasional lightweight tweak here-and-there to shore-up an equivalency.
You're right about Islam being at a different stage in its evolution.
You're wrong about this being an apples-to-apples comparison, with respect to declarations of their Founders or the content of their sacred texts.
Those striving for moral equivalency for Islam vis-a-vis Christianity will invariably point to the Old Testament for similar permissions to commit violence.
The trouble with that is, that the teachings of the New Testament override those of the Old - the Old is there merely as historical background and continuity with Judaism and is oftentimes utilized to cover situations not already covered in the New.
Jesus of Nazareth taught his followers to Love Thy Neighbor and to Turn the Other Cheek - not just sometimes, but always.
Consequently, if some passage in the Old Testament gives permission to kill or wage war, Jesus' teachings in the New Testament override and nullify that permission.
Granted, in practice, and in the Real World, it oftentimes does not work that way.
But, whenever Secular Christendom gets too bloody, the more peace-loving of its practitioners need do no more than to point to the Core Teachings of the Master, in order to begin to bring Christendom back to the Middle again, and away from the Extreme.
That serves as a "brake" or "slaughter rule" or "limiting factor" agent or reset button, within Christendom.
Islam has no such brake or reset button.
Islam also specifies that its so-called Prophet is the ultimate and very last of the Prophets, and that the word of the Q'uran is the ultimate word of God, never to be changed, never to be updated, never to be reinterpreted, never to change.
Consequently, Islam will never have a true Reformation, despite the fact that it is sorely and desperately in need of one.
We have two Houses in front of us for consideration.
Each House leans in a different way, because of the nature of its foundation.
And it is the nature of the foundation and core teachings of Islam which make it far more dangerous and undesirable and incompatible than its peers.
Ya'll can try to rationalize that all the live-long day, but, in the final analysis, this is, indeed, a matter of differences in foundation, and consequent prospects for the future.