Lord knows, you've left behind scorched souls
Black children left chilling, later found burnt whole
So sadly, your glory's to come urgently
He left some people, more specifically children, in fires because of their ethnicity. He hates the black race, and therefore it is only black babies that he has left to burn.
Because he has done so, he is deemed unworthy to enter heaven, thus going to hell, as explained in the next line.
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