"Deadly" or "mortal" sins, as well as the "seven deadly sins" are most often associated with Roman Catholicism. Do Lutherans believe certain sins are deadly? What does it mean that a sin is "deadly?" If you like ATP, check out the book series. Each volume contains answers to questions Pastor has answered online, often including more material. You can purchase them on Amazon here: https://tinyurl.com/53h74v3e Do you like the work Pastor is doing on ATP? Would you like to support "Ask The Pastor?" You can donate here via PayPal: https://tinyurl.com/yadhlqfl