Here "justified" means that God puts us in a right relationship with himself. You can translate this in an active form. Alternate translation: "How much more will God do for us now that he has made us right with himself because of the death of Jesus on the cross" (See: [[rc://en/ta/man/translate/figs-explicit]] and [[rc://en/ta/man/translate/figs-activepassive]])
Here "wrath" is a metonym that refers to God's punishment of those who have sinned against him. Alternate translation: "God's punishment" (See: [[rc://en/ta/man/translate/figs-metonymy]])