Final answer:
Bhai Maha Singh Ji was the leader of the 'Chaali Mukte' who fought alongside Guru Gobind Singh Ji in Muktsar. Sikhism, led by martyred Guru Tegh Bahadur, is a monotheistic faith founded by Guru Nanak Dev Ji.
Step-by-step explanation:
The leader of the 'Chaali' (40) Mukte, who fought for Guru Gobind Singh Ji in Muktsar, was Bhai Maha Singh Ji. The Chaali Mukte were a group of forty Sikhs who sacrificed their lives fighting against the Mughal forces in the Battle of Muktsar. This battle was a significant event in the history of Sikhism, showcasing the valor and commitment of the Sikh warriors.
Answering part of the question's context, Guru Tegh Bahadur, the ninth guru of Sikhism, was executed by the Mughal Emperor Aurangzeb. He was the leader of the Sikh religion, which is a monotheistic faith originating in the Punjab region and established by Guru Nanak Dev Ji. Guru Tegh Bahadur's martyrdom is remembered as a pivotal point that strengthened the resolve of Sikhs to resist Mughal oppression.