Heaven is hearing Mahalia Jackson sing the gospel in Madison Square Garden. Hell appears to be sitting next to people who believe in God.

In The Gospel Singing the hip folk (drunks and stoners) hang in the right corner. Heaven, and the three god-fearing souls with 'God' 'is' 'Love' ties lurk in the shadows at the bottom.

Hockney's dad was a good working class bloke but a Methodist, rather than a souless commie. He was also a rare pacifist during WWII and a conscientious objector. 

Nonetheless, Hockney did not care much for religion.