Actually if there is God, one should worship according to the dictation of God. But if he does not know what is God, what is the dictation of God — then he is a rascal. What is the use of his so-called worship? It may be to some extent sentiment, but that is not worship. If you want to worship God, you must worship God according to His dictation. That is real worship. How he can manufacture the way of worship? If you want to worship God, you must worship according to the dictation of God. If you have no such dictation, if you have no idea of God then how you can worship God?

From Srila Prabhupada’s Discussion on Charles Darwin.