There are about 1.2 billion Catholics throughout the world.
they call Adherents followers
There are approximately 1.2 billion Catholics in the world.
They are called "Jews".
follow, stick to
As of the early 21st century, Christianity has around 2.2 billion adherents within the world population of about 7 billion people. However, one must question how many of these are adherents simply because they were born into the faith as opposed to a rational choice of belief. So the answer to your question of how may people 'say' they are Christian could not be answered without polling all 2.2 billion supposed adherents.
Muslim
Christianity has the most adherents globally, with over 2 billion followers.
It is said that there are 360 million adherents of Buddhism in the world today.
The candiates adherents helped him to win the campaignPeople who believe in a particular religion are said to be adherents of that faith.
In the world today, there are 2.4 million Hindus. It is the religion with the third largest amount of adherents.
Around 1600 million Muslims; per PEW Forum study as of October 2009
Christians are the majority religious group with approximately 2.1 billion adherents.