They are very similar and both are a form of monotheism, or the belief in one god. Zoroastrianism believers follow a man named Zoroaster just as Christians low the works of Jesus. Christianity is the largest religion in the world today but, in 300 A.D. Zoroastrianism spaned from Egypt to China.
They are exactly the same.
You need to specify what is is that we need to compare the rise of Christianity in the Roman Empire to.
See the link below for a chart comparing Islam, Christianity and Judaism.
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Judaism started out as more popular, then Christianity was created, and it became more popular.
Roman Catholic AnswerThere is no way to compare Christianity and Catholicism as they are one and the same thing.
Christians are Christians they need something to compare against in order to have similarities
Christianity/catholic
It is difficult to compare Hinduism and Christianity because Hinduism presents limitless depths and has a rich history. It is the most ornate religion in the world. Christianity has characters that are historically rooted, while Hinduism has a history that gets blurred by theology and mythology.
Rivalry between Isaac and Ishmael has persisted through the centuries in the antagonisms between Jews and Arabs.
Having tattoos or not having is not related to Hinduism. Hinduism is a very liberal religion if you compare it with the Abrahamic religions like Christianity, Islam, and Judaism.
Both religions, Christianity and Islam, were orginated by God through God revelation of the Bible and Quran to respectively the prophets Jesus and Muhammad (peace be upon them).