The almost endless list of islamic militias that do exactly that, while justifying it with a quran, suggests otherwise.
Look, it's not like such islamist groups are the exception... There are hundreds and hundreds of them. All glorifying holy war and martyrdom in the most gruesome of ways. Sure, by and large they are a minority, but quite a sizeable one. Far to big to wave them away as having nothing to do with the religion.
Now, if we lower the bar a bit and also include those people who do not join such groups, but who have some level of support or sympathy for them, we quickly get into double digit percentages.
We could lower the bar a bit further and also include those people and nations who fully support "internal" barbarity like execution of gays, stoning "adulterers" (including rape victims), amputation of hands/feet of thieves, execution for blasphemy, execution for apostacy etc, and the number keeps on rising and rising.
Clearly there are things in Islam that inspire such gruesome barbarity and violence.
Just so you know, christianity used to be not so different. The text of the bible didn't change - the people did. To the point where these days, in most civilized nations, all those horrible bits in the bible are blatantly ignored and not even taught anymore. Yet some of those things still turn up quite oftenly, like with the homophobia in the US and alike.
Considering all of the above, I can only call it "being in denial" when people say that it has nothing to do with the religion. Clearly that isn't true. The trends, the amount of militia's, the level of sympathy, the internal barbaric "laws" and punishments,... they can't simply be cast aside and ignored.