They were accused of attacking the prayer home at Cheema Road in Sunam on May 17, 2007 where a youth was killed and many others were injured in a clash between Sikh activists and Sacha Sauda followers.
Additional Sessions Judge Varinder Aggarwal gave them the benefit of doubt while acquitting them.
A mob armed with swords and axes had tried to barge inside the prayer home despite police resistance.
The boundary wall of prayer home was damaged and an attempt was also made to set it on fire.
The accused were charged under offences of murder, attempt to murder and other sections of the IPC.