I keep this, a total morale destroyer,  designed especially for the most persistent offenders.  My rule of thumb:  if I know their face, they've been on at me once too often. 

I particularly like its versatility, as it applies not just to religious nuts but also to people who want to sell you stuff. 

It will fit on your average business card, so you can print it as a series of card labels, for example. 

All rights reversed:  copy and disseminate at will
YOU NEED TO BE TOLD THIS
Your approach is bizarre and insulting
All that is most dear to you
is dear mostly to you
All that you live for will die with you
Your highest hopes are dust and ashes
and so are you. 
Forget your comforting lies
there is nothing you can do.