I must say you have a peculiar interpretation of "Life without Jesus is wasted" if you don't think that says something quite ugly about non-Christians.
Oh, I do think the message is quite ugly; my point was that inclusion/exclusion is probably an even bigger issue in terms of the mental well-being of teenagers.
It isn't necessary for a kids to accept thr statement as true to suffer harm. Even without accepting it as true, the fact that it implies the message "I exclude non-Christians from my peer group" makes it inappropriate.