The 2000 Census says:
73.8% are Roman Catholic.
15.4% are Protestant.
7.4% are Atheist.
1.3% are Spiritualist.
2.1% are something else.
Christianity is the most practiced religion in Brazil
Islam
Roman Catholicism is the most common religion in Brazil.
Most people in the middle east practice islam
Most Taiwanese practice a combination of Buddhism, Confucianism and Taoism.
Judaism (75%).
Christianity, I guess
Islam
Christianity, which is the majority religion in all of South America.
Roman Catholic
Most people in the US who profess any religion profess to be Christians. There are many denominations of Christianity in the US.
The same as most of Europe: Christianity.