The essence of the Bible, is, "Love God. Love Neighbour." Anybody detracting from this is using their own or somebody elses authority.
The koran on the other hand, teaches submission to Allah, by conversion, with the sword if necessary.
The 9/11 and 7/7 bombers didn't twist the teaching, they took the Jihad to the infidel, us, just as is taught.
Please consider the thoughts of this Lebanese lady, Brigitte Gabriel, who can speak on this with greater clarity.
http://www.americancongressfortruth.com/