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Please define "this country" - many countries have different dominant religions.
I think that the Baptist religion, like many religions, can be found in more than half of the world's country. Churches of the Baptist religion, however, are mainly in the US.
The largest religion in the US is Christianity but it's a country of many different religions. Church and state are separated, so we are not a country of any one religion.
There is no country currently where there is a 100% population of a certain religion.
No country has a Zoroastrian majority. There are minorities in many countries, notably India, Iran and Pakistan.
Samoa is a country, not a religion.
Its a country not a religion.
A country where the government is not influenced by religion; it does not have a state religion.
The only country as Hinduism as their national Religion is Nepal. In India Hinduism is not a national Religion.
Haiti is a country, not a religion.
It is only a religion.
There is no "one world religion." There are many different cultures throughout the world and many different religions. Some nations have an official religion for their country, but there isn't a "one world religion" of any kind. Christianity is the most commonly practiced religion in the world, but it certainly isn't the ONLY religion of the world, neither is it the official religion of the world.