Greatest Artists in History:
Sculptors/Painters
Michelangelo - christian
Leonardo da Vinci - christian
Raphael - christian
Donatello - christian
Vincent Van Gogh - christian
Caravaggio - christian
Constantin Brăncuși - christian
Aleijadinho - christian
Authors
Shakespeare - christian
Leo Tolstoy - christian
Fyodor Dostoevsky - christian
Mark Twain - arguably agnostic
Rumi - muslim
Muhammad Iqbal - muslim
Virginia Woolf - atheist/arguably agnostic
Miguel de Cervantes - christian
Hans Christian Andersen - christian
Jane Austen - christian
Agatha Christie - christian
Sun Tzu - somewhat taoist (???)
Confucius - confucianist (???)
Musicians
Ludwig van Beethoven - christian
Wolfgang Amadeus Mozart - christian
Taichovsky - christian
Bach - christian
Chopin - christian
And many others, of many faiths
I believe political labels are retarded, but nearly none of the people listed here would fit into your 'left wing', either by virtue of being religious or by taking into account their personal views upon the world
AND WE'VE BARELY GOTTEN INTO PHILOSOPHY (because its not an 'art', altough I believe leftards could do some more thinking) but the list is getting long, so I'll stop here even if it could go on