Christians have done some bloody horrible things to each other - all in the name of God and the "Prince of Peace", Jesus (e.g. Burnings at the stake, The 30 Years War, The Spanish Inquisition, to name just a few).
It would seem that it matters not what this or that "holy book" says. The only thing that counts is the willingness of its readers to practice what they preach. And in that regard, Christians have had no better track record than anyone else. This irony was not lost on the newly converted "heathens" of the African continent, leading to the following parody of the hymn "Onward Christian Soldiers"
Onward Christian Soldiers, into heathen lands,
Prayer books in your pockets, rifles in your hands,
Bring the gladsome tidings, where trade might be done,
Preach the peaceful Gospel, with the Maxim gun.
As other posters have already pointed out, the marked divergence between Islam and Christendom (which has developed over the last three or four centuries) has little to do with the Bible, and much more to do with other factors.