[CholeraJoe]

Islam has been around about as long as Christianity had at the time of the Salem witch trials. Who's to say what it will be like in another 400 or so years?

Every extreme act committed by Islam can be compared to those committed by Christianity in times past. Witch burnings, the Inquisition, the Crusades, and the Genocide against Native Americans were every bit as extreme as those perpetrated by Islam.

[Erasmus]

Islam has been around about as long as Christianity had at the time of the Salem witch trials. Who's to say what it will be like in another 400 or so years?

The monsters (well, all right, cosmically misguided earthlings) in Salem didn't have worldwide terrorists and nukes. Who's to say civilization can last another 400 more years for them to get sane? Or 100?

[Max in Utah]

Witch burnings, the Inquisition, the Crusades, and the Genocide against Native Americans were every bit as extreme as those perpetrated by Islam.

Here's where the difference lies between Christianity and islam:
The atrocities you mention were committed in direct opposition to Jesus' teachings, therefore the perpetrators were Christians in name only. The muslims' atrocities were in accordance with Mohammed's edict to "fight against and slay the unbelievers wherever you find them."