Christianity wasn't the first and only religion. Paganism as well as Judaism pre-dates Christianity by quite a bit. Also, because human kind doesn't follow one set of guidelines, and each person is capable of thinking for themselves, the variances are numerous, no different than a persons race or ethnicity.
other religions began to form such as Christianity
The state religion in the UK is the Church of England, a variety of Christianity, but many people belong to other religions and many people do not regularly attend any form of worship, even if they nominally belong to a religion.
they each were able to practice whatever religion they wanted, as long as it was a form of Christianity.
Yes, there were forms of Judaism and other religions that existed before the time of Christ, but Christianity as a distinct religion did not emerge until after the life and teachings of Jesus Christ.
Christianity was the main religion all over Europe, for many centuries. It still is.
The most prominent religion in Brazil is Christianity, where Roman Catholics form the vast majority. However, other religious such as Islam and Buddhism are also practised in Brazil.
Kublai Khan followed a form of Tibetan Buddhism known as Sakya Buddhism. He also respected and supported other religions in his empire, such as Daoism, Christianity, and Islam.
The main religion of Frankfurt is Christianity in one form or another However due to the cosmopolitan nature of all of the major city's in the EU most religions will have some representation
Some of the main religions in Frankfurt include Christianity (Protestant and Catholic), Islam, Judaism, and Buddhism. There are also smaller communities of Hindus, Sikhs, and other religious groups in the city.
It is hard to say as the majority of people practice Buddhism although there are a few exceptions to that as some may choose to practice Christianity or another religion. However, I think the most practiced religions are firstly Buddhism and then Christianity.
The plural form of religion is religions.
One of the Greek religions is Greek Orthodox, a form of christianity.