When I left the Jehovah's Witnesses, I still believed that Jehovah existed but was not prepared to serve vengeful bully who threatened to destroy his creation and had demonstrated his ability to do so. I raged against his cool indifference to humanity's suffering and his failure to prevent acts of god.
The anger and frustration left me when I realized that the whole Daddy in the Sky idea was a hoax. Suddenly life on earth made sense. I accepted that the world is the way it is because it can be no other way.
Pain and suffering are a part of life, as is joy and happiness. Life is not fair; how could it possibly be, given the random nature of events beyond human control. I blame wicked men for their greed and selfishness. Natural disasters are par for the course on a planet that is suspended in space and whizzing round an aging sun.
No god or gods to blame and no devil or demons to blame. No need to rage in anger against a non-existent, invisible fantasy. No need to choke with anger at the Biblical accounts of the fictitious atrocities of the Hebrew desert god Jehovah. Just the peace of enjoying being alive on such a beautiful planet until my time is over. Peace is possible without a head-full of nonsense.