Catechism
324 The fact that God permits physical and even moral evil is a mystery that God illuminates by his Son Jesus Christ who died and rose to vanquish evil. Faith gives us the certainty that God would not permit an evil if he did not cause a good to come from that very evil, by ways that we shall fully know only in eternal life.
420 The victory that Christ won over sin has given us greater blessings than those which sin had taken from us: “where sin increased, grace abounded all the more” (Rom 5:20).
The angels were not in heaven when they sinned. (See No. 40 below)
Baltimore Catechism
- Which are the chief creatures of God?
The chief creatures of God are angels and men.
Thou hast made him a little less than the angels; thou hast crowned him with glory and honor; and thou hast set him over the works of thy hands. (Psalm 8:6-7)
- What are angels?
Angels are created spirits, without bodies, having understanding and free will.
Thousands and thousands ministered to him, and ten thousand times a hundred thousand stood before him. (Daniel 7:10)
- What gifts did God bestow on the angels when He created them?
When God created the angels He bestowed on them great wisdom, power, and holiness.
O ye angels of the Lord, bless the Lord. (Daniel 3:58)
- Did all the angels remain faithful to God?
Not all the angels remained faithful to God; some of them sinned.
And there was a battle in heaven; Michael and his angels battled with the dragon, and the dragon fought and his angels. And they did not prevail, neither was their place found any more in heaven. (Apocalypse 12:7)
- What happened to the angels who remained faithful to God?
The angels who remained faithful to God entered into the eternal happiness of heaven, and these are called good angels.
See that you do not despise one of these little ones; for I tell you, their angels in heaven always behold the face of my Father in heaven. (Matthew 18:10)
Catechism
392 Scripture speaks of a sin of these angels.269 This “fall” consists in the free choice of these created spirits, who radically and irrevocably rejected God and his reign. We find a reflection of that rebellion in the tempter’s words to our first parents: "You will be like God."270 The devil “has sinned from the beginning”; he is “a liar and the father of lies”.271
393 It is the irrevocable character of their choice, and not a defect in the infinite divine mercy, that makes the angels’ sin unforgivable. "There is no repentance for the angels after their fall, just as there is no repentance for men after death."272
390 The account of the fall in Genesis 3 uses figurative language, but affirms a primeval event, a deed that took place at the beginning of the history of man.264 Revelation gives us the certainty of faith that the whole of human history is marked by the original fault freely committed by our first parents.265/
397 Man, tempted by the devil, let his trust in his Creator die in his heart and, abusing his freedom, disobeyed God’s command. This is what man’s first sin consisted of.278 All subsequent sin would be disobedience toward God and lack of trust in his goodness.