The religion in ancient Egypt was absorbed into other ancient religions. This was common throughout the ancient world. For example, Isis was the goddess of motherhood, beauty, love, and rebirth. She came to be identified with Hera and Aphrodite under the Greeks, and then later with Juno under the Romans. The word for this process is [*syncretism*](https://en.wikipedia.org/wiki/Syncretism?wprov=sfti1).
This didn’t just happen in Egypt. It happened in Gaul with Celtic gods, in the near east with Phoenician gods, in Spain with Iberian gods, etc. It also happened outside of the Roman Empire, but that’s not relevant to your question.
Pretty much the only group that successfully resisted this process were the Jews, who were notorious for their unwillingness to go along with that sort of thing.
In 343 BC Egypt was conquered by Artaxerses III, a Persian emperor, and the last native Egyptian pharaoh was deposed. Egypt would not be ruled by another native Egyptian until 1953. This began a slow process of syncretism with various conquerers’ religions, first with the Persians, then with the Greeks, then most importantly with the Romans. By the 300s AD, the Egyptian religion had been entirely fused with Roman state practices, and had begun to die off as a daily faith. When Christianity replaced the Roman state religions, it happened in Egypt as well.
Egypt was increasingly Christian until the Muslim conquest in the 600s. Then, it was gradually Islamicized over the next 500-600 years.
Today, Egypt is 85-95% Muslim, with a small Christian minority.
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