Here "the gift" refers to God's freely erasing the record of our sins. Alternate translation: "The gift is not like the result of Adam's sin" (See: [[rc://en/ta/man/translate/figs-explicit]])
The abstract nouns "judgment," "trespass," "condemnation," and "justification" can be expressed as verbs. Alternate translation: "God declared that all people deserved to have him punish them because one man committed one sin, but the gift is greater because he gave it after many people had committed many sins, and by giving the gift he justified them" (See: [[rc://en/ta/man/translate/figs-abstractnouns]])