You have captured the essence of angels or at least my belief in them and their work for mankind. I believe they are with us everyday to protect and watch out for us. I think in this line the "and" should be "an"

Merciful Lord sends and angel, filling hearts pitch as coal

Good work. 5/5

Wow what a poem. The dark days of our lives and then Angels are sent to show us there is light left in this dark cruel world. Great word choices and fantastic imagery!
Love
Mom