Religions are like rivers: there is upstream, downstream, rapids, still waters, and a delta where the religion reaches the global ocean. Christianity and Judaism have both flowed through such a river and are now, by and large, part of the global ocean of civilizational values. Buddhism has traveled the same route, and its key values are now global. Hinduism is in the delta stage, with varying streams approaching the ocean. This is not to say that all religions are in a perfectly peaceful place; there are pockets of extremism and rigidity, but by and large, most of the world's religions share civilizational values today.
Islam, the youngest of the great religions, is in a fever that is roiling not only Muslims, but every neighbor they have in the world. Small but determined groups can terrorize huge populations that had grown accustomed to order. Suicide bombers, truck bombers, and carefully staged assassinations do not need to kill masses of people to sow terror.
There is a worldwide trend that is alarming, but understandable: a trend to put an end to the problem, sweeping up both criminal zealots and ordinary practitioners. We are seeing this now with Russia and China: threats of total extermination of their Muslim populations.
Russia. Russia's problem is several centuries old. In the 19th century, they conquered all the old Muslim city-states (the Silk Road) across Asia, incorporating them into the Russian Empire. During the early days of the Russian Revolution in 1917, these Muslim states were freed, then absorbed again as the Soviet Union became the new Russian Empire. With the collapse of the Soviet Union, the Muslim states once more asserted their freedom, but Russia has pulled most of them into a neo-imperial union. Although Russia conquered these Muslims, they never fully pacified them. We are seeing this now. The region is suffering both internal warfare (nationalism vs. Islamism) and ethnic warfare, the results of Stalin's campaign to displace whole populations and draw borders that are deliberately designed to divide and conquer.