We even have statistical evidence:
Pew Research (2013):
http://www.pewglobal.org/2013/09/10/muslim-publics-share-concerns-about-extremist-groups/
Wenzel Strategies (2012):
58% of Muslim-Americans believe criticism of Islam or Muhammad is not protected free speech under the First Amendment.
45% believe mockers of Islam should face criminal charges (38% said they should not).
12% of Muslim-Americans believe blaspheming Islam should be punishable by death.
43% of Muslim-Americans believe people of other faiths have no right to evangelize Muslims.
32% of Muslims in America believe that Sharia should be the supreme law of the land.
http://www.andrewbostom.org/blog/2012/10/31/sixty-percent-of-us-muslims-reject-freedom-of-expression
ICM Poll:
Pew Research (2010):
http://pewglobal.org/2010/12/02/muslims-around-the-world-divided-on-hamas-and-hezbollah/
WZB Berlin Social Science Center:
http://www.gatestoneinstitute.org/4092/europe-islamic-fundamentalism
Pew Global (2006)
World Public Opinion (2009)
http://www.worldpublicopinion.org/pipa/pdf/feb09/STARTII_Feb09_rpt.pdf
NOP Research:
http://www.cbsnews.com/stories/2006/08/14/opinion/main1893879.shtml&date=2011-04-06
People Press Surveys
http://www.people-press.org/2004/03/16/a-year-after-iraq-war/
Belgian HLN
*16% of young Muslims in Belgium state terrorism is "acceptable".
ICM Poll:
*25% of British Muslims disagree that a Muslim has an obligation to report terrorists to police.
Pew Research (2007):
http://pewresearch.org/assets/pdf/muslim-americans.pdf#page=60
Al-Jazeera (2006):
http://wikiislam.net/wiki/Osama_bin_Laden
Populus Poll (2006):
http://www.populuslimited.com/pdf/2006_02_07_times.pdf
http://www.danielpipes.org/blog/2005/07/more-survey-research-from-a-british-islamist
GfK NOP:
http://www.civitas.org.uk/pdf/ShariaLawOrOneLawForAll.pdf
NOP Research:
http://www.cbsnews.com/stories/2006/08/14/opinion/main1893879.shtml&date=2011-04-06
MacDonald Laurier Institute:
http://www.torontosun.com/2011/11/01/strong-support-for-shariah-in-canada
al-Arabiya:
http://www.alarabiya.net/articles/2011/09/10/166274.html
Gallup:
http://www.washingtoninstitute.org/policy-analysis/view/just-like-us-really
Policy Exchange:
http://www.imaginate.uk.com/MCC01_SURVEY/Site%20Download.pdf