Well I mean given that I can't go out and talk to a billion and a half people to understand them all I can go on is what I read about the magnitude.
ICM Poll: 20% of British Muslims sympathize with 7/7 bombers
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NOP Research: 1 in 4 British Muslims say 7/7 bombings were justified
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People-Press: 31% of Turks support suicide attacks against Westerners in Iraq.
A Year After Iraq War | Pew Research Center
YNet: One third of Palestinians (32%) supported the slaughter of a Jewish family, including the children:
PJ Media
http://www.ynetnews.com/articles/0,7...053251,00.html
World Public Opinion: 61% of Egyptians approve of attacks on Americans
32% of Indonesians approve of attacks on Americans
41% of Pakistanis approve of attacks on Americans
38% of Moroccans approve of attacks on Americans
83% of Palestinians approve of some or most groups that attack Americans (only 14% oppose)
62% of Jordanians approve of some or most groups that attack Americans (21% oppose)
42% of Turks approve of some or most groups that attack Americans (45% oppose)
A minority of Muslims disagreed entirely with terror attacks on Americans:
(Egypt 34%; Indonesia 45%; Pakistan 33%)
About half of those opposed to attacking Americans were sympathetic with al-Qaeda?s attitude toward the U.S.
http://www.worldpublicopinion.org/pi..._Feb09_rpt.pdf
Pew Research (2010): 55% of Jordanians have a positive view of Hezbollah
30% of Egyptians have a positive view of Hezbollah
45% of Nigerian Muslims have a positive view of Hezbollah (26% negative)
43% of Indonesians have a positive view of Hezbollah (30% negative)
http://pewglobal.org/2010/12/02/musl...and-hezbollah/
Pew Research (2010): 60% of Jordanians have a positive view of Hamas (34% negative).
49% of Egyptians have a positive view of Hamas (48% negative)
49% of Nigerian Muslims have a positive view of Hamas (25% negative)
39% of Indonesians have a positive view of Hamas (33% negative)
http://pewglobal.org/2010/12/02/musl...and-hezbollah/
Pew Research (2010): 15% of Indonesians believe suicide bombings are often or sometimes justified.
34% of Nigerian Muslims believe suicide bombings are often or sometimes justified.
http://pewglobal.org/2010/12/02/musl...and-hezbollah/
16% of young Muslims in Belgium state terrorism is "acceptable".
http://www.hln.be/hln/nl/1275/Islam/...aardbaar.dhtml
Populus Poll (2006): 12% of young Muslims in Britain (and 12% overall) believe that suicide attacks against civilians in Britain can be justified. 1 in 4 support suicide attacks against British troops.
http://www.populuslimited.com/pdf/2006_02_07_times.pdf
http://www.danielpipes.org/blog/2005...itish-islamist
Pew Research (2007): 26% of younger Muslims in America believe suicide bombings are justified.
35% of young Muslims in Britain believe suicide bombings are justified (24% overall).
42% of young Muslims in France believe suicide bombings are justified (35% overall).
22% of young Muslims in Germany believe suicide bombings are justified.(13% overall).
29% of young Muslims in Spain believe suicide bombings are justified.(25% overall).
http://pewresearch.org/assets/pdf/mu...ns.pdf#page=60
Pew Research (2011): 8% of Muslims in America believe suicide bombings are often or sometimes justified (81% never).
28% of Egyptian Muslims believe suicide bombings are often or sometimes justified (38% never).
http://www.people-press.org/2011/08/...for-extremism/
Pew Research (2007): Muslim-Americans who identify more strongly with their religion are three times more likely to feel that suicide bombings are justified
http://pewresearch.org/assets/pdf/mu...ns.pdf#page=60
ICM: 5% of Muslims in Britain tell pollsters they would not report a planned Islamic terror attack to authorities.
27% do not support the deportation of Islamic extremists preaching violence and hate.
http://www.scotsman.com/?id=1956912005
http://www.danielpipes.org/blog/2005...-islamist.html
Federation of Student Islamic Societies: About 1 in 5 Muslim students in Britain (18%) would not report a fellow Muslim planning a terror attack.
http://www.fosis.org.uk/sac/FullReport.pdf
http://www.danielpipes.org/blog/2005...itish-islamist
ICM Poll: 25% of British Muslims disagree that a Muslim has an obligation to report terrorists to police.
http://www.icmresearch.co.uk/reviews...ms%20Nov04.asp
http://www.danielpipes.org/blog/2005...itish-islamist
Populus Poll (2006): 16% of British Muslims believe suicide attacks against Israelis are justified.
37% believe Jews in Britain are a "legitimate target".
http://www.populuslimited.com/pdf/2006_02_07_times.pdf
http://www.danielpipes.org/blog/2005...itish-islamist
Pew Research (2013): At least 1 in 4 Muslims do not reject violence against civilians (study did not distinguish between those who believe it is partially justified and never justified).
http://www.pewforum.org/uploadedFile...ull-report.pdf
Pew Research (2013): 15% of Muslims in Turkey support suicide bombings (also 11% in Kosovo, 26% in Malaysia and 26% in Bangladesh).
http://www.pewforum.org/uploadedFile...ull-report.pdf
PCPO (2014): 89% of Palestinians support Hamas and other terrorists firing rockets at Israeli civilians.
http://www.jihadwatch.org/2014/08/po...cks-on-israely
Pew Research (2013): Only 57% of Muslims worldwide disapprove of al-Qaeda. Only 51% disapprove of the Taliban. 13% support both groups and 1 in 4 refuse to say.
http://www.pewglobal.org/2013/09/10/...remist-groups/
http://www.pewglobal.org/2013/09/10/...remist-groups/
See also:
http://wikiislam.net/wiki/Muslim_Statistics_(Terrorism) for further statistics on Islamic terror.