In the 11th century, a massive split occurred in Christianity, creating two different branches: the Eastern Orthodox Church and the Roman Catholic Church
The Catholic Church engaged in corrupt practices like the sale of indulgences and simony, leading to Martin Luther's criticism and the Protestant Reformation
The Catholic Church initiated the Catholic Reformation or Counter Reformation, addressing some of the Protestant critiques but also reaffirming key doctrines
The Islamic empires in the Middle East, the Ottoman Empire and the Safavid Empire, were divided along the Sunni-Shia split that originated in the 7th century
Sikhism demonstrated unity by holding on to significant doctrines of both belief systems, but also demonstrated change by discarding distinctions like the caste system and gender hierarchies