Read this Pew Reseach study to learn about how many muslims across the world are peaceful, and how many are not.
http://www.pewresearch.org/fact-tank/2016/07/22/muslims-and-islam-key-findings-in-the-u-s-and-around-the-world/Plenty of your fellow Americans are concerned. Christians quit witchburning, but muslims didn't stop stoning women who have the misfortune of being raped---they do now.
How do Americans and Europeans perceive Muslims?
A Pew Research Center survey conducted in 2014 asked Americans to rate members of eight religious groups on a “feeling thermometer” from 0 to 100, where 0 reflects the coldest, most negative possible rating and 100 the warmest, most positive rating. Overall, Americans rated Muslims rather coolly – an average of 40, which was comparable to the average rating they gave atheists (41). Americans view the six other religious groups mentioned in the survey (Jews, Catholics, evangelical Christians, Buddhists, Hindus and Mormons) more warmly.
Republicans and those who lean toward the Republican Party gave Muslims an average rating of 33, considerably cooler than Democrats’ rating toward Muslims (47).
Republicans also are more likely than Democrats to say they are very concerned about the rise of Islamic extremism in the world (83% vs. 53%) and in the U.S. (65% vs. 38%), according to a December 2015 survey. That survey also found that Republicans are more likely than Democrats to say that Islam is more likely than other religions to encourage violence among its believers (68% vs. 30% of Democrats) and that Muslims should be subject to more scrutiny than people of other religions (49% vs. 20%). Overall, most Americans (61%) say Muslims should not be subject to additional scrutiny solely because of their religion, while U.S. adults are closely divided on the question of whether Islam is more likely than other religions to encourage violence.
About half of Americans (49%) think at least “some” U.S. Muslims are anti-American, greater than the share who say “just a few” or “none” are anti-American, according to a January 2016 survey. On the other hand, the same survey also found that most Americans (59%) believe there is a lot of discrimination against Muslims in the U.S. today, and even more (76%) say discrimination against Muslims in the U.S. is on the rise.
Nearly half of U.S. adults (47%) say they do not personally know a Muslim, while a similar share (52%) do know at least one person who is Muslim.
In spring 2016, we asked residents of European counties whether they viewed Muslims favorably or unfavorably. Perceptions varied across European nations, from a largely favorable view in France (67%), Germany (65%) and the United Kingdom (63%) to a less favorable view in Italy (25%), Poland (19%) and Hungary (14%).
