God's kindness to us is the reason he made it possible for us to be saved from judgment if we simply trust in Jesus. AT: "God saved you by grace because of your faith in him" (See: [[rc://en/ta/man/translate/figs-activepassive]])
"In Christ Jesus" and similar expressions are metaphors that frequently occur in the New Testament letters. They express the strongest kind of relationship possible between Christ and those who believe in him.
Walking on a path is a metaphor for how a person lives his life. Here "in them" refers to the "good deeds." AT: "we would always and continually do those good deeds"