From Nothing to Be Frightened Of by Julian Barnes:
The first time I went to church with my family — for a cousin’s wedding — I watched in amazement as Dad dropped to his knees in the pew, then covered his forehead and eyes with one hand. Where did that come from, I asked myself, before making some half-heartedly imitative gesture of piety, attended by furtive squinting through the fingers. It was one of those moments when your parents surprise you — not because you’ve learnt something new about them, but because you’ve discovered a further area of ignorance. Was my father merely being polite? Did he think that if he simply plonked himself down he would be taken for a Shelleyan atheist? I have no idea.