I love this sentiment. Even as a reluctant atheist, I love it.
Not only would it make the world a much kinder place, but if you believe that Jesus was the Son of God (or even just a solid guy), the message on this church sign also adheres to one of his clearest and most repeated messages, stated most simply in Matthew 22:39:
"Thou shalt love thy neighbor as thyself."
Take solace, bigots. If you think that same sex marriage is an abomination, or if you think transgender children should be forced into restrooms that make them uncomfortable, or if you believe that African Americans or Mexicans or the Irish (shout-out to old school racists) are sub-human, why not just leave everyone alone and trust in God to deal with these people in Heaven?
Eat some ice cream. Take a walk. Adopt a cat. Learn to play pinocle. Do something for yourself with the full knowledge that these terrible, rotten, no good, very bad people will be punished for eternity by someone more powerful than you.
Just love everyone. It'll allow you to remain a bigot but will also allow you to enjoy your life a little more and shout a lot less.