Only by human efforts (through God’s grace) can racism end; only by dismantling racism can justice come about – and without justice, we cannot live as members of God’s kingdom.
Without the final clause, I'd use the semicolon between the first two. Without the first clause, I'd use a dash between the second two. In conversational writing, I'd use a semicolon and a period, and just start a new sentence with "and," rules be damned. But I can't do that in academic writing, and the combination of semicolon and dash looks awkward to me.
Members of the jury, what is your decision?