Which religion is the largest in the world?

• A. Islam
• B. Hinduism
• C. Christianity
• D. Buddhism

Answer: (C)

The size of a religion is measured by how many people identify with it. Christianity is the largest worldwide because it has spread across many regions for centuries and maintains very large communities on every continent, with roughly 2.3 billion adherents. This broad and enduring presence comes from historical missionary activity, conversion, and cultural influence across Europe, the Americas, Africa, and parts of Asia. Islam is also very large, often listed as the second-largest, while Hinduism is most prominent in India and the Indian diaspora, and Buddhism has significant followings but fewer adherents overall. So, among these options, Christianity has the greatest number of followers globally.