My favorite artist is Albrecht Dürer. I knew his work before I knew his name. Here is one of his most famous pieces.
I also like a large painting in the US National Gallery of Art titled Daniel in the Lions Den by Peter Paul Reubens. Daniel was in trouble for praying.
Why is prayer controversial? If a person does not believe why should it bother them when others want to pray?
Today is designated in the US as National Day of Prayer. If you would like to learn more, here is a history:
If my people, which are called by my name, shall humble themselves, pray and seek my face and turn from their wicked ways, then I will hear from heaven, and will heal their land.
2 Chron. 7:14