USCCB - Catechesis in the Catholic Church

Catechism of the Catholic Church

False. Para. 391: Behind the disobedient choice of our first parents lurks a seductive voice, opposed to God, which makes them fall into death out of envy (Cf. Gen 3:1-5; Wis 2:24). Scripture and the Church's Tradition see in this being a fallen angel, called "Satan" or the "devil" (Cf. Jn 8:44; Rev 12:9). 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" (Latern Council IV [1215]: DS 800).