No, Catholicism was not the first religion to be established. It originated in the 1st century AD, while other religions like Hinduism and Judaism have much earlier origins.
He re-established Catholicism in France
It is the main branch of Christianity. Actually, Catholicism IS Christianity, the original Christian Church as established by Christ. Everything else is a branch or twig.
The first Celts existed before Catholicism, so they were no Catholic. Once Catholicism was established, there were Celts still around and some of them did become Catholics.
Catholicism, until Henry VIII established the Church of England.
The radical Republicans did believe that Catholicism was a threat to the democracy of the US because of the anti-democracy teachings then.
The Spanish were largely responsible for bringing Catholicism to the United States, especially in the southwestern states - Texas, New Mexico, Arizona and California.
Catholicism.
The two established religions in the 16th Century (the 1500s) were Buddhism, Hinduism, Judaism, Islam, Christianity in the forms of Roman Catholicism, Eastern Catholicism, Lutheran, Anglican and other Protestantisms, Daoism, and one or more others that I'm inadvertently leaving out.
Christianity is one of World's religions in fact it has the most adherents, approximately 2.1 billion. Catholicism (or Roman Catholicism): This is the oldest established western Christian church and the world's largest single religious body. (According to the CIA world fact book)
The Eastern Orthodox faith was established in 1054 with the Great Schism. At this time, the East split from the West and established two churches: Eastern Orthodoxy and Roman Catholicism.
Christianity ( Protestant 70% of Christianity in US Catholicism around 30% )