Only Christianity can provide a solution to the problem of sin.
We know that we aren't perfect. We know that we should do better. We know that there is a perfect moral law that governs us, and we don't live up to it (Romans 3:23).
Atheism denies all of these obvious facts.
Other worldviews recognize them, but tell us that we must do better -- that we must be perfect -- that we must fix the problem of sin.
Christianity alone tells us the obvious truth -- that we can't be perfect. We can't fix the problem of sin.
However, the God that created all of us can. (Mark 10:26-27)
In fact, He has.
Only Christianity tells us about the God who loves you so much that He took your penalty on His shoulders -- that He shed His own blood on the cross to pay the debt of our sin, provided we accept His free gift (Romans 6:23; John 3:16; Acts 20:28; Revelation 1:5; Romans 10:9).
Only Christianity fully recognizes the reality of sin, the inability of man to fix the problem, and the graciousness of a perfect God to offer to solve it for us.