Non Muslims are always confused about Islam. Some says Islam is religion of peace and Mullahs are misguiding them and making them extremists and in tolerant towards other religious believers. Some says Politicians use make them extremists and exploit. Some believes US and Israel are doing atrocities against them and making them terrorists.
Please do not believe in all these. You can understand them easily and authentically. It is very simple you devote couple of your valuable hours to study and understand their holy book and Hadiths. Online English versions of both are available from in numeral sources over Internet.
More than 80 percent of world Muslims are Sunnis and they believe a genuine Muslim is the one who follows both the holy book and Hadiths. So you need to study both the books. You have to keep in mind the beliefs of the Muslims while studying their books and understand them in their context. Holy Books is God given and Hadiths are the example and guidance for them to follow as demonstrated by their prophet with his own life. Whatever the prophet did in his life time were for the Muslims to follow whether is the mass killing of Jews and idol worshipers or looting their belongings or raping and keeping their woman folks as columbines.
A genuine Muslim is the one who follows the prophet. Now you decide whether Islam is the Religion of peace or not.