What has Christianity truly contributed to humanity

[Bucky Ball]

These composers explicitly rejected the notion of any gods or religious dogma.
They all wrote religious music :Bartok, Beethoven, Berlioz, Bizet, Brahms, Debussy, Delius, Kabalevsky, Khachaturian, Mahler, Maxwell Davies, Mozart, Orff, Paganini, Prokofiev, Ravel, Rimsky-Korsakov, Rorem, Rubinstein, Anton, Saint-Saens, Schubert, Schumann, Shostakovich, Sibelius, Smyth, Strauss, Richard, Tchaikovsky, Vaughan Williams, (also worked for the Church of England), Virgil Thomson, Verdi, Wagner

What is your source for this? How do we know that all of these composers "rejected the notion of any gods or religious dogma"?

I'll let you do your own research.