Bottom line, without God, how can we justify calling things "evil," "wrong," or "immoral" if there is no God? In truth, these things are simple preferences or opinions without God. Tim Keller put it like this, " The existence of evil is not evidence of God's absence in our universe. No, it's evidence of God's absence in our lives."
Resources:
"Reflections on the Existence of God" by Richard Simmons
https://www.amazon.com/Reflections-Existence-God-Richard-Simmons/dp/1939358221/ref=sr_1_3?crid=2FHGISNKNAD8G&keywords=existance+of+god&qid=1643638982&sprefix=existance+of+%2Caps%2C80&sr=8-3
Craig, W.L., "The Moral Argument," drcraigvideos, June 8, 2016,
https://www.youtube.com/watch?v=OxiAikEk2vU
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