The blood thirsty Batinis

A Qaramite by the name of Ahmad began to propagate the Batini teaching in Iraq after the year 891 AD. The following are some of his teaching [1]

• Only 2 daily prayers instead of 5
• Removed the obligatory religious bath
• Allowed drinking of the intoxicants
• Allowed the killing and looting of non-Batinis

The Qarmaṭians instigated what one scholar termed a "century of terrorism" in Kufa. They considered the pilgrimage to Mecca a superstition and once in control of the Bahraini state they launched raids along the pilgrim routes crossing Arabia: in 906 they ambushed the pilgrim caravan returning from Mecca and massacred 20,000 pilgrims [2]

According to the view of historians the distinguishing characteristic of the Batini school is that it interprets the external aspects of Islam in an esoteric manner and considers the externals of the Shari'ah to be only for simple-minded people of little intelligence who are deprived of spiritual perfection. Yet occasionally the Batini Imams did order certain regulations and laws to be practiced and followed. [1]

References
[1] Shia by Allamah Sayyid Muhammad Husayn Tabatabai
[2] Qarmatians on Wiki