Well you should at least name a few factors contributing to terrorism that you consider to be of greater influence than Islam.
There aren't any.
First of all, consider the fact that Germany united under the banner of
racial superiority in response to the struggles they had in the Weimar Republic. It was a common trait among most of the German populace, and it allowed them a higher ground to persecute minorities during the Holocaust.
The borders in the Middle East are the result of European imperialists who drew borders based on geographic features and political preferences, rather than ethnoreligious boundaries. As a result, Iraq looks like this:
The problems with the Middle East run really deep into 20th century history, but the fact of the matter is that lots of groups in the Middle East are extremely pissed at Western civilization for the fact that we've continuously invaded their lands for the past century (likewise we're pissed at them because they kill our soldiers and blow up our buildings). It is logistically impossible for them to unite against us under an ethnic or national identity, because the ethnic groups are fragmented and the national borders were invented by colonialists. Instead, they unite under the fact that they share a common religion: Sunni Islam.
The way I look at it is that religion is a convenient common trait that they can unite with, in opposition to Westerners. But if another viable ideology existed which Iraqis, or Syrians, or Arabs in general could unite under, they might have picked it instead.
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