Are sunni Muslims considered radical Muslims?

Answer 1

"Radical-ness" operates entirely separately from the Sunni-Shiite divide. There are radical Sunnis, like Islamic State, al-Qaeda, Jubhat an-Nusra, Salafists, the Saudi Government and Hamas. There are radical Shiites, like the Iranian government, Hezbollah, the Houthis, Jaysh al-Mahdi, and Asa'ib al-Haqq. Conversely, there are Liberal Muslims and Conservative-but-Gentle Muslims coming from both traditions. This is because the divide between Sunnis and Shiites concerns who has the right to lead the Islamic World more than some doctrinal difference in behavior.