Is it a sin to get angry?
In the Bible, Jesus himself got angry, so anger itself is not a sin. Perhaps-as was true for Jesus-if we are angry at something that is unjust, our anger might help us take action to help the victim or to change what is unfair. But anger is also dangerous, and too much harm has been done in the world by people acting out of anger in hurtful ways.
So when you feel angry, I suggest these three steps:
Anger itself is not a sin. It is what we do when we are angry that will make all the difference in the world.