The top three ( I am not sure this is the correct order), are Eastern Orthodox, Protestant, and Catholic.
Catholicism is, & it also happens to be the oldest form too.
Roman Catholicism
The most widespread religion on earth is Christianity, followed closely by the Baha'i Faith.
The most widespread religion is Christianity.
the emigration of Christians to non-Christian areas around the world
The two main ones were Mithraism and Christianity.
Christianity has long been geographically widespread.This is mostly due to missionaries who travel the world to spread the "Good News."
With around 2.4 billion adherents split into three main branches of Catholic, Protestant and Eastern Orthodox, Christianity is the world's largest religion
A poll stated that 'Africe' has the most Christians - approximately 340 million. See related link for countries with Christian population data:
More than likely, God had a lot to do with it.
the most widespread cactus is prickly pear
Christianity and Muslim are two of the major religions in Europe
Comman bermudagrass is one of the most widespread horticultures.