no one is arguing that religious fundamentalism, when under the right conditions, can lead to horrible acts of violence. we're simply disputing the idea that there's something inherent in Islam that makes it more violent than any other religion. I think the history of the world disproves the idea that circumstance + dogma can't lead to violence in a lot of different faiths.
and putting that aside, where does this argument over what % of the reason for terrorism is strictly religion and what % is geopolitical get us? shouldn't we be talking about what to do to prevent terrorism from happening? and two things we can do without harming any non-terrorist Muslims along the way are pretty obvious: 1) end the imperialist US/UK/etc. presence in the Middle East, and 2) stop giving money to the most radical Islamic terror state in the world. how are either of those things controversial?