Christianity is the largest religion in the world, with more than 2 billion followers; some sources put it at about 2.5 billion adherents.

Quick Scoop

  • Largest overall: Christianity.
  • Largest major branch if counted separately: Sunni Islam.
  • Global rankings can vary a little depending on how traditions and sects are grouped.

Why this can look different

Some lists count Christianity as one religion, while others split religions into major branches or sects. That is why you may see Islam, especially Sunni Islam, described as the largest tradition in certain breakdowns.

In plain language

If you mean the largest religion worldwide in the broad sense, the answer is Christianity.

Information gathered from public sources available on the internet and portrayed here.