A person's behavior is spoken of as if that person were walking along a path. Alternate translation: "Many are living" or "Many are conducting their lives" (See: [[rc://en/ta/man/translate/figs-metaphor]])
Here "the cross of Christ" refers to Christ's suffering and death. The enemies are those who say they believe in Jesus but are not willing to suffer or die like Jesus did. Alternate translation: "in a way that shows they are actually against Jesus, who was willing to suffer and die on a cross" (See: [[rc://en/ta/man/translate/figs-metonymy]])