When the angels sang "Glory to God in the highest, and on earth peace, good will toward men," they weren't saying that there would be an end to wars and strife. This wasn't peace among men they were heralding but rather peace toward men from God. They were announcing the end of the war between God and mankind. God isn't mad anymore. He's not even in a bad mood. God loves us. That's the good news they were proclaiming, and that should be our message too.