The subject line has nothing to do with the
message. The question should have been sent to the owner's address for
discussing list matters. I can't tell if the message actually comes from
you or if it is a spoof. There are too many problems with it.
You ask if you can use a Christian tag line.
religious tag lines have always been allowed. But the example you give is
not a Christian tag line. This raises questions as to whether the message
was sent by someone as a hoax.
If you want to discuss the matter further, please
send further messages to the owner's address.