Atheism as a worldview offers no concept or grounding of ultimate justice—Hitler, Stalin, and Mao get away with it in the end. After all, they can only die once. New Atheist Richard Dawkins admits as much:
“In a universe of blind physical forces and genetic replication some people are going to get hurt, other people are going to get lucky, and you won’t find any rhyme or reason in it, nor any justice. The universe we observe has precisely the properties we should expect if there is, at the bottom, no design, no purpose, no evil and no other good. Nothing but blind pitiless indifference. DNA neither knows nor cares. DNA just is. And we dance to its music.”
If there is no God then there is no ultimate justice. On the other hand, Christianity fits with our idea of ultimate justice because we believe in God. For as Christians, we can ask with Abraham, “Will not the Judge of all the earth do right?” (Gen. 18:25). Justice is just one of the many examples demonstrating the excellent worldview fit Christianity offers.