The oldest religion would be monotheism, much similar to Judaism (That is, if Adam and Eve were the the first parents).
We understand Catholicism as the fulfillment of Judaism. All religion before was building up before that.
Some evidence for this is that some native African groups have very similar beliefs of creation compared to Judaism, and that many native Americans also have a monotheistic thinking. Perhaps kind of like "broken telephone" with monotheism originally uniform, but variations were added as the time went by.
The Catholic Church is the original and oldest Christian religion with roots dating back about 2000 years.
Roman Catholic AnswerYou can't compare them, they are the same thing.
Catholic-Jewish-Christianity. Following was Muslims and Islams (there is a difference).
Catholicism is the oldest religion in Europe. It is also the largest.
The oldest religion of Japan is animism. Then came Shinto.
Christianity is the oldest religion in Europe.
Hinduism is the Oldest, and Zoroastrianism is the third oldest.
.Catholic AnswerThe Catholic Church was formed by Our Blessed Lord around the year 33 A.D. (1st century), Islam was started by Mohammed in the 7th century, and the Orthodox split from Rome (the Catholic Church) in the 12th century.
Catholicism was the religion of the Catholic Reformation.
Catholic religion and Greek Christianity are somewhat similar, but other Greek religions are not similar to the Catholic religion.
Jainism is not the oldest religion of the world. Animism and Hinduism have been cited as the oldest religions of the world.
Catholic is a religion so if you say what is a catholic i think you are referring that a catholic is a religious person from the catholic religion