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Darren can win an argument against himself
If darren has never lost an argument he cannot lose one against himself and thus cannot win an argument against himself.
It is impossible to prove if God exists.
How do you define need? If you mean it as a question of what you ought to believe, rather than a question of what is, you are correct. However, since what one should believe is not necessarily connected to what's true, it's pointless to argue what you should believe when the question is what's true.