Undeniably, there is violence in the OT. But in contrast to the Koran, it has an historical context that makes it difficult to apply to today's world. In other words, slaying the Hittites becomes problematic once one realizes that there are none to be found.
But slaying the infidel is an open-ended call to violence against the unbeliever.
The Bible and the Koran are two distinctly different religious texts.