Who is a Modern Day / 21st Century Christian? This is someone who believes that Jesus Christ died for them out of love and has accepted this sacrifice and daily endeavors to live for Christ. Simply put, a Believer/Disciple of Jesus Christ.How should such a person live? For Christ- as His ambassadors and as a fragrance of Christ in this world. 2 Corinthians 2:15: For we are the fragrance of Christ among those who are being saved and among those who are perishing. 2 Corinthians 5:15-17.