This is one of the most idiotic animated charts I’ve ever seen.
In reality, the colours need to be weighted for population for greater accuracy. Nor to mention the missing cults and sects in each colour, such as Protestantism, Mormonism, Shia, Catholicism, etc., each of it having had it’s share of expansion, conquest and retreat. Plus, large areas of the blue ought to be replaced with a colour for agnosticism / atheism, in the West.
Please, feel free to post links to better animated charts that you have seen on the subject.
It’s missing some outlying areas of Christianity. Ethiopia was Christian by the 4th century. And though it never dominated, Christianity was in India and even western China within the first millennium.