Changing from one religion to another is called the same for any of them: conversion.
catholic is a very nice religion and like it but no one knows at all
Catholic is one of them.
From the Catholic point of view the person would be an apostate - one who deserts his religion for another. From the Protestant view - a convert.
There are many places where one can learn about the Catholic religion online. This includes sites dedicated to the Catholic faith, Wikipedia, blogs and forums.
catholic/christian
The religion of Malta is the Roman Catholic apostolic religion.
He's catholic.
The Roman Catholic Church is the world's largest religion, with over a billion members. It includes about one-sixth of the world's population.
The traditional religion of Andorra is the Roman Catholicism. About the 90% of the population are Roman Catholic. One of the two co-princes of Andorra is a Catholic bishop.
About one billion are Catholic; but not all practice the faith
There are many religions in Portugal but the most dominate one is Roman Catholic
The Catholic religion is the original Christian religion. All other Christian denominations can trace their roots back to the Catholic Church. Since there are about 33,000 Protestant denominations, it would be impossible here to discuss all the differences.