The Mughal emperors of India were predominantly Muslim. The Mughal dynasty was founded by Babur, a Central Asian Turko-Mongol Muslim. The Mughals followed the Sunni branch of Islam and patronized the construction of many grand mosques and shrines throughout their empire.

Some key points about the religion of the Mughal emperors:

• Babur, the first Mughal emperor, was a Sunni Muslim who claimed descent from both Timur and Genghis Khan.

• Humayun, the second Mughal emperor, was also a Sunni Muslim. He faced challenges from Hindu rulers as well as the Shia Safavid dynasty in Persia.

• Akbar, the third and arguably most famous Mughal emperor, was religiously tolerant. While he was born a Sunni Muslim, he founded a new syncretic religion called Din-i-Ilahi that incorporated elements of Hinduism, Islam, Zoroastrianism and other faiths.

• Subsequent Mughal emperors like Jahangir, Shah Jahan and Aurangzeb were again devout Sunni Muslims who tried to impose Islamic orthodoxy more strictly across their empire.

So in summary, the Mughal emperors were predominantly Sunni Muslim rulers, though Akbar notably experimented with religious syncretism during his reign in the late 16th century.