If only God would give me some clear sign! Like making a large deposit in my name at a Swiss bank.

Allen’s line parodies the classic religious plea for certainty—“a clear sign” from God—by translating it into a thoroughly modern, materialist wish: money, discreetly placed in a Swiss bank. The humor depends on the collision between spiritual longing and worldly self-interest, suggesting that what the speaker really wants is not metaphysical reassurance but tangible benefit. It also satirizes the way people can treat faith instrumentally, as if divine communication should arrive in the form of personal advantage. The Swiss-bank detail sharpens the joke by invoking secrecy, privilege, and the fantasy of effortless wealth.