Jehovah's Witnesses derived their policy of excommunication from 1 Corinthians 5:9-13, a small fraction of religious text compared to the overall compendium of religious books that the world's religions revolve around.
In my letter I wrote you to quit mixing in company with fornicators, not [meaning] entirely with the fornicators of this world or the greedy persons and extortioners or idolaters. Otherwise, you would actually have to get out of the world. But now I am writing you to quit mixing in company with anyone called a brother that is a fornicator or a greedy person or an idolater or a reviler or a drunkard or an extortioner, not even eating with such a man. For what do I have to do with judging those outside? Do you not judge those inside, while God judges those outside? “Remove the wicked [man] from among yourselves.” 1 Corinthians 5:9-13
The conceptual here can be picked up by any Bible based religious group. Jehovah's Witnesses have incorporated this Bible based policy into their belief system.
http://www.sixscreensofthewatchtower.com/1hatred.html
Can you imagine a religious organization that professes to be Christian but commits some of the most heinous hate crimes in the world? Do you know of any religious organization that enforces and encourages hatred toward those who leave? Although denied by Jehovah's Witnesses, the Watchtower Society is one such religious organization. The leaders of the Watchtower organization masterfully paint flawless "Christian" reputations for their followers, glazing the surface to conceal deep rooted hatred. The strictly enforced policies from the Watchtower Society deny all loyal members from any association with those who have left the so-called "truth", including family members and lifetime friends. When a person becomes baptized within the Watchtower organization and later frees themselves from the bona fide cult, they are expelled or "disfellowshipped" from the organization. Watchtower leaders provide loyal followers with strict instruction to have nothing to do with a "disfellowshipped" person, not even saying hello to them. Much of the Watchtower Society's literature is tantamount to spiritual pornography with clearly defined inflammatory instructions encouraging Jehovah's Witnesses to hate other people. An ongoing malicious campaign of hate, an "us vs. them" attitude is clearly seen within this quasi-religious and spiritual supremacist group. Members believe in the superiority of their "religion" over all other religions. In this arena of spiritual elitism, spiritual lynching runs rampant. A continuous condemning of all other faiths is readily seen. By fostering these extremist views, Watchtower members are displaying unrestrained and overt hatred. This clearly makes the Jehovah's Witnesses an easy to recognize "hate group". Fellow members participating in encouraged and enforced hatred include: the Aryan Nation, the Ku Klux Klan, and radical Islamic groups. This dangerous and destructive atmosphere is harmful and can do an enormous amount of damage in society. Former Jehovah's Witnesses who attempt to expose these dangerous and destructive tactics of the Watchtower Society are labeled as "apostates", and Watchtower leaders falsely accuse such ones as leaving Jehovah to be on Satan's side. Jehovah's Witnesses loathe apostates more than they would a murderer or a pedophile, frightened to even look at such ones. This fear is so extreme that if a Jehovah's Witness encounters a so-called apostate within a grocery store, they will find the nearest produce stand to hide behind, as if they were under physical attack. Watchtower leaders intentionally instill this fear to prevent loyal followers and their financial contributions from leaving, realizing exposure to such "apostates" will enable them to discover the real "truth" behind the Watchtower Society. Through examining the following information one can transparently determine that the supposed "spiritual food" from Jehovah is nothing more than spiritual poison clouding the minds of loyal followers and preventing them from leaving this multi-billion dollar sales corporation.
Because of “sacred” religious text, Islamic fundamentalists incorporate a physically violent agenda into their religion.
http://en.wikipedia.org/wiki/Jihad
Within classical Islamic jurisprudence—the development of which is to be dated into the first few centuries after the prophets death—jihad is the only form of warfare permissible under Islamic law, and may consist in wars against unbelievers, apostates, rebels, highway robbers and dissenters renouncing the authority of Islam.
In the UK and USA, Christianity has been modernized unlike Islamic fundamentalist states with a reputation for sponsoring terrorism. This creates some ambiguity for the topic at hand. Jehovah's Witnesses may put into practice certain agendas as instructed by the religious text that their religion is based on, but the focus here seems to be somewhat misguided into a religious group instead of the root cause of a religious group's actions. So what's the conclusion to be reached? The overall paradigm of Christianity is sinister, or just Jehovah's Witnesses?