Sufism is practiced in many forms and by many types of people all over the world, many of them Muslim, some not. All religions have their mystical branches, meaning those who seek a direct and intense communion with the divine, outside of traditional rituals and doctrines. Conventional religious leaders sometimes dismiss mystics as woolly-headed or heretical or both—perhaps fearing that anyone who bypasses religious institutions and heads straight to God could put them out of business. Since 2016, the Islamic State has killed many Sufi worshippers in mass executions.