The problem of evil points to God.
When we express something as evil,we have to have a standard of good,and that good is the Triune God of Scripture.
The atheist can call something evil,but hasn’t a foundation to explain why it is evil. If someone says rape isn’t evil,the atheist ( made in the image of God)knows this is false,but has no way of any authoritative grounding to declare their view is absolute.The atheist has to borrow from the Christian worldview to try and make sense of their worldview.