In contrast to many imaginative writings, Catholic Church doctrine actually has little to say about the devil. The Catechism of the Catholic Church simply quotes the teaching of the Fourth Lateran Council in 1215:
“The Church teaches that Satan was at first a good angel, made by God: ‘The devil and the other demons were indeed created naturally good by God, but they became evil by their own doing.'”
This brief statement affirms two things: (1) Satan was created by God. He is not an evil force equal to God, but one of God’s creatures. (2) Satan was created good. By his own free choice he turned to evil. He was not created evil by God.
*******Devils are not given names in Scripture. The word “satan” is a Hebrew noun that means an adversary, tester, accuser. It was translated into Greek as “diabolos” which essentially means the same thing. “Diabolos” was translated into English as “devil.”
Source: The Little Black Book