Christianity the catholic chritian religion has the most of all christian religions
Christianity
The most... what? As of 2014, the religion with most followers worldwide is Christianity.
Catholicism
I think you mean "What religion has the most followers." In that case, the answer is Christianity.
Christian
I think you mean "What religion has the most followers." In that case, the answer is Christianity.
The second-largest religion, worldwide, is Islam.
Christianity has the most followers, it is the largest religion in the world.
Christianity. It has approximately 2.1 billion followers.
Christianity has the most followers in Europe and the Americas. Islam is the second largest religion in these regions.
Islam is a religion - therefore the answer is Islam.
If by largest you mean the most followers, it's Hinduism.
The answer is in your Question: Islam and its followers are called Muslim