Amon was one of the major gods worshiped by the Egyptians beginning around 2000BC. He became so important in their religion that he became worshiped as if he were the Sun god Re, and eventually the two gods were merged together as one called Amon-Re (or Amun-Ra, among various other spellings), and served as the chief god of the Egyptians for many years.
Amon-Re was worshipped because he was the sun god. You can go to Bing or Google and search him up too.
Amon-Re was the main god in the cult of Amon-Re, which was the cults of Amon and Re combined.
Amon-Re was important for what he represented as a god; the king and the sun, the creator, and the hidden powers of the universe.
Yes, Amon-Re was an egyptian god.