While there's not really a specific traditional greeting for Christians on Good Friday, as some have noted, there is a semi-traditional greeting for Easter Sunday: “Christ is risen!” To which the traditional response is: “He is risen indeed!”. read more
Blessed Good Friday, God bless, or anything similar. As long as you remember it’s the most solemn day of the year for Christians, you’ll do fine. In fact, you needn’t send a Good Friday ‘greeting’. Wait until Easter Sunday and wish your Christian friends ‘Happy Easter’. read more