God only knows. But, he does know. This is the point of Psalm 139.
Think of it this way on Sanctity of Life Sunday — When the Nazis gassed Jews and then incinerated them, the soot of image bearers curled into the air before falling over the land like coal dust.
No one remained clean. A layer of human soot spoiled the soil.
And, whether or not the citizens of Dachau, Treblinka and Auschwitz tasted the human dust when it poisoned their cultural water, whether or not they saw the ash of the murdered when they swept it off their streets, whether or not they heard the muffled scream of human smoke, the God of heaven and earth, who knit the Holocaust victims together in their mother’s womb – – He knew, and knows, and will repay (Romans 12:19).
Read Psalm 139, the whole thing, and remember that God knows.