A S Byatt 
Body Art (Storycuts) 

Damien, a gynaecological consultant and lapsed Catholic, replaces Christian icons with modern art; he worships the absence of God in the abstract staining of paint and ink. But when a vagrant young art student shows up in the ward, he once more has cause to question his personal and aesthetic convictions. Part of the Storycuts series, this short story was originally published in the collection Little Black Book of Stories.