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Roman Catholicism is prominent in Spain, Portugal, France, and Italy.
An organized branch of Christianity is called denomination.
Let us go in order of the history of Christianity. Christianity started as one church. However, tensions rose and this church split into two separate churches around 1043: the Roman Catholic Church and the Eastern Orthodox Church. A second split came around the 1500s and a new branch was formed: Protestantism (splitting off Catholicism). These three major forms of Christianity had their own area in Europe. Northern Europe was predominately Protestant. Western Europe was predominately Catholic. Eastern Europe was predominately Orthodox. The same remains today.
No it is a branch of paganism
Christianity did not become widespread popular until the Roman Empire adopted the religion. It quickly became the largest religion in Europe. Christianity calls upon its followers to spread the religion to others. This led to forced converting and prosecution against non-Christians, most notably Muslims and Jews. Christianity has also experienced two major splits. The first came in 1054 when the religion split into two major branches: Roman Catholicism and Orthodoxy. The next split came in 1517 and the third major branch, Protestantism, was formed. Western and Southern Europe remained predominately Catholic, Eastern Europe predominately Orthodox, and Northern Europe predominately Protestant. Differences in religion led to wars as well.
The largest religion in Western Europe is Catholicism, which is the largest branch of Christianity. However, the fastest growing "religion" in Western Europe is no religion, as more and more Europeans in general are becoming unaffiliated or recognized Atheists.
Mormon
Methodist is a branch of the Protestant religion. That is a branch of Christianity.
Eastern Europe is mostly Orthodox, which is a branch of Christianity (Greek Orthodox and Russian Orthodox are some examples). However, there are also large Catholic populations throughout.
because
Protestantism
Catholic