I think I have heard it argued from Hegel, that idealism brought to bear on real-world events develops with a logic of Terror (named for the French revolution Terror). When a fixed ideal of human being, expressed completely in concepts, the result for real exhaustible humans is terror; to meet the ideal we must subtract whatever most obviously does not conform - with the guillotine or the progrom or the camp.
This reading is quite applicable to religions - many atrocious crimes can be attributed to some zealous attempt to bring heaven to earth right now, and can be justified by the criminals based on ideas and often, by texts. I think 'Islamic' Terrorism can be read this way: it is too easy to say that no terrorist is a true muslim and no true muslim is a terrorist. Islam does not have secularism in its foundation, and it has a lot of text expressing ideals for human being.
I have misgivings about Christians who want Christianity to be bible-based. As a distinction from other Christianities it may be useful, but as a distinctive from the world it is destructive and leads to the kind of 'terroristic' confrontation described above. Christianity is a man-centered religion, the God-man in particular. In the bible and by the Holy Spirit, one can get a pointer to that man. But its like sailing to the North pole.
If I want to get to the North Pole, but will have some easting or westing in whatever straight-ahead line I choose, I must continually recheck. Standing on the equator and heading North-west will take me in a great circle around the earth to where I started. I need to go and then find the local North-west that will correct my drift away to the south. What the bible says to you will evolve as you move North. Who it points you to will not.
