Probably the nearest analogy is the Thuggee cult of ancient India -- and the Brits eventually stamped that out.
From Wikipedia:
Thuggee Origins
The thuggee religion was allegedly a cult with both Hindu and Muslim members who practiced large-scale robbery and murder of travellers by strangulation. Induction was typically passed from father to son, with the women of the household being kept ignorant of the cult's activities.
Both of the factions into which the Thuggee belonged were divided by the Nerbudda river. Also, both Thuggee factions laid claim to antiquity. While members of the northern faction , however, did not trace their origin further back than the period of the early Muslim kings of Delhi, members of the southern faction not only claimed an earlier and purer descent, but adhered also with greater strictness to the rules of their profession.
The earliest authenticated mention of the Thugs is found in the following passage of Ziau-d din Barni's History of Firoz Shah (written about 1356):
"In the reign of that sultan (about 1290), some Thugs were taken in Delhi, and a man belonging to that fraternity was the means of about a thousand being captured. But not one of these did the sultan have killed. He gave orders for them to be put into boats and to be conveyed into the lower country, to the neighborhood of Lakhnauti, where they were to be set free. The Thugs would thus have to dwell about Lakhnauti and would not trouble the neighborhood of Delhi any more." (Sir HM Elliot's History of India, iii. 141).
Though they themselves trace their origin to seven Muslim tribes, the Hindu followers only seem to be related during the early periods of Islamic development; at any rate, their religious creed and staunch worship of Kali, one of the Hindu Tantric Goddesses, showed no Islamic influence. Assassination for gain was a religious duty for them, and was considered a holy and honorable profession, in which moral feelings did not come into play. It should be noted, however, that not all followers of Kali are thuggees, and the majority do not share the thuggee viewpoint.
Beliefs and practices
The Thugs were a well-organized confederacy of professional assassins who travelled in various guises through India in gangs of 10 to 200, worming themselves into the confidence of wayfarers of the wealthier class. When a favorable opportunity arose, the Thug strangled his victim by throwing a yellow scarf or Rumal (symbolic of Kal Bhairab) around the neck, and then plundered and buried him. All this was done according to certain ancient and rigidly prescribed forms, and after the performance of special religious rites, in which the consecration of the pickaxe and the sacrifice of sugar formed a prominent part. Due to the fact that they used strangulation as the method of murder they were also frequently called "Phansigars", or "noose-operators."
The will of the goddess by whose command and in whose honor they followed their calling was revealed to them through a very complicated system of omens. In obedience to these, they often travelled hundreds of miles in company with, or in the wake of, their intended victims before a safe opportunity presented itself for executing their design. When the deed was done, rites were performed in the deity's honor, and a significant portion of the spoils was set apart for Her.
They believed each murder prevented Kali's (their goddess's) arrival for 1000 years. The fraternity also possessed a jargon of their own (Ramasi), as well as certain signs by which its members recognized each other in the most remote parts of India. Even those who from age or infirmities could no longer take an active part in the ritual murder continued to aid the cause as watchers, spies, or dressers of food. Because of their thorough organization, the secrecy and security of their operation, and the religious pretext in which they shrouded their murders, they were recognized as a regular tax-paying profession and continued for centuries to practice their craft, free of inquiry from Hindu rulers.
British destruction of the cult
Thuggee was suppressed by the British rulers of India in the 1830s, due largely to the efforts of William Sleeman, who started an extensive campaign involving profiling, intelligence, and executions. A police organisation known as the Thuggee and Dacoity Department was established within the Government of India and remained in existence until 1904 when it was replaced by the Central Criminal Intelligence Department. The defeat of the Thuggees played a part in securing Indian loyalty to the British Raj.
According to the Guinness Book of Records the Thuggee cult was responsible for approximately 2,000,000 deaths. Gang leader Behram (or Burham) has often been considered to be the world's most prolific serial killer with 931 killings between 1790 and 1830 attributed to him. Reference to contemporary manuscript sources, however, shows that Behram actually gave inconsistent statements regarding the number of murders he had committed, and that while he did state that he had "been present at" more than 930 killings committed by his gang of 25-50 men, elsewhere he admitted that he had personally strangled no more than 125 people. Having turned King's Evidence and agreed to inform on his former companions, furthermore, Behram never stood trial for any of the killings attributed to him, the total of which must thus remain a matter of dispute [James Paton, 'Collections on Thuggee and Dacoitee', British Library Add.Mss. 41300].
"I'm not a lawyer, however I believe a strong distinction can be made that islam is 'unique' amongst 'religions' (again, I submit that islam is not a religion, but I'll use that word in this context) in that its foundational writings encourage its adherents to kill those that aren't in its club. No other religion (as far as I know) calls out for killing non-believers. Thus I believe the case can be made that islam is not a religion but a dangerous mental disorder/philosophy."
To be honest, I do believe that Islam is a religion. Even if you are right that a case could be made that it is not, I would prefer not to do it that way.
I would prefer a short, concise constitutional amendment to make it clear that Congress can make a law regarding establishment of religion---if that religion incorporates the idea of killing and injuring American citizens and damaging our property.
According to a piece on FR the other day, Germany is considering outlawing the Koran. Presumably, they'll insist it's not a religion but a murderous cult inimical to native German values.