It is not true. Islam; as an Arabic origin word; means full submission and surrender to God. So, Islam is the faith since start of universe creation. All God prophets to mankind called for Islam in its general sense of God worship as the one and only one God with no partner, no son, no father, no companion, no associate, and no equivalence. Islam per God revelation of Torah to Moses is called Judaism. Islam per God revelation of The Bible to Jesus is called Christianity. Islam per God revelation of Quran to Muhammad is called the very name Islam as it is the last God message to humanity and as Muhammad is the last God prophet.
So, Judaism, Christianity, and Islam are same source religions from same God for the same message.
Christianity
The dominant religion in the Roman Empire was the Roman religion until Christianity became the dominant religion.
they studied Christianity after they were conquered
Before Christianity came to Britain, the priests of the ancient Briton were of the Druid religion. This was a pagan religion and they offered human sacrifice.
Christianity differs from ancient Roman religion in several key ways. One major difference is that Christianity is monotheistic, believing in one God, while Roman religion was polytheistic, worshiping multiple gods and goddesses. Additionally, Christianity emphasizes the importance of faith, salvation, and forgiveness, while Roman religion focused more on rituals, sacrifices, and appeasing the gods. The concept of an afterlife and the idea of a personal relationship with God are also central to Christianity, whereas these were not prominent beliefs in ancient Roman religion.
Before Christianity, they were pagan.
Yes ancient Greece and ancient Egypt have gods and goddesses. They also have modern religion of Islam and Christianity.
Christianity thanks to all the misionary work it is over 50%
Somehow they believed in a religion that is practically considered hell in Christianity.
They both originated from the ancient Hebrew religion along with modern Judaism.
No she was not, Christianity did not exist as any kind of major religion in the time of Ancient Greece.
the ancient method of living and style of navpreet leader contribute to the devolment