If Adam and Eve were the first persons God created, where did the devil in the Garden of Eden come from?
Adam and Eve were the first human persons created, but the devil and other angelic persons were created before them. Angels are pure spirits (CCC 328-30). Neither the creation account in Genesis 1 or Genesis 2 discusses the creation of the devil, who is presented in the form of a serpent (see Genesis 3:1). His creation is assumed as well as his fall as he plots against Adam and Eve.
Scripture speaks of the devil and other angels as sinning against God, which resulted in their consignment to hell (see 2 Peter 2, CCC 391-93). In Satan’s rebellion, a third of the angels—represented by stars—went with him (see Revelation 12:3-4, 7-12). Stars occasionally represent angels in Scripture (e.g., Revelation 1:20, Judges 5:20). The Latin words—Non serviam—“I will not serve"—are traditionally associated with the devil, who pridefully refused to serve God in his kingdom.
By Tom Nash