Which polls? There are many polls that have methodological and reliability issues, especially when they try to gauge sentiments in countries with highly stifled freedom of speech and belief. I wouldn't consider their results to be definitive.
Either way, though, I think there are many factors aside from just a religion that give rise to militant activities and support thereof. That includes socioeconomic, geopolitical, and educational ones, mainly. Of course, a subset of ideologies are more likely to be held by militants, but I think such ideologies usually develop and arise in the first place not because of something inherent in any given religion but because of material conditions and circumstances like the few I listed.
When it comes to Islam, the most militant sects and interpretations of it clearly don't inspire the vast majority to "blow each other up," and the religion is far too diverse and large of an umbrella for most generalized statements to accurately apply to it.