Related:

• If Diet Coke did not exist it would have been necessary to invent it. -- Karl Lehenbaue
• If God did not exist, it would be necessary to invent him. -- Voltaire, "Epitres, XCVI
• If God had not created beer, man would have had to invent it.
• Of course it's possible to write good fiction in a world you didn't invent--mainstream writers do it now and then.
• If God had not given us sticky tape, it would have been necessary to invent it.
• If God did not exist it would be necessary to invent Him.
  But all nature cries aloud that He does exist; that there is a supreme intelligence, an immense power, an admirable order, and everything teaches us our own dependence on it....