Both sacred texts justify violence and both religions have extremist elements who will gladly use these passages to justify their horrible acts. The difference in our current time is that it seems to be occurring more often among certain elements in Islam due to the impact of modern technology and secularism upon traditional cultures in the Islamic world.
I've noted any number of times that the bible has its own violence that it justifies and those verses have been used by Christians for millennia to justify atrocities, but usually I've heard responses from people who wish to declare Islam is inherently evil and inferior to Christianity. They fail to see the danger inherent in all sacred texts that the religious authority they are given can be mixed with violent extremism with horrible consequences.
We Christians should be careful lest we ignore the plank in our own eye when it comes to our use of scriptures.
Grace and Peace,