Answer: Islam
Step-by-step explanation:
The religion of Egypt is mostly Islam owning to the fact that they are Arabs and close to the Middle East. Historically, the Egyptians had their own religion which had gods such as Ra and Osiris but as Egypt was conquered by various empires, their religion changed.
When the Muslims conquered and annexed Egypt completely from the Christian Byzantine empire in 646, Arabs flooded into the country over the next centuries and made the country's religion, Islam. There exists a very small minority of Christians however known as the Coptic Christians.