It's often said that if atheism were true, there would be no ultimate justice for our actions. The wicked would go unpunished and the good would go unrewarded. While there's no universal requirement for justice to exist, isn't the lack of justice in an afterlife an imperative to working towards justice in this life? Surely if we know that this life is it, and we abhor injustice and wicked deeds, then that's motivation to do something about it.
If it could be said in atheism there is no ultimate justice, then it theism there is no motivation to do something about it.