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Absolutely. It sounds idiotic...until you bother to think about it. Objectivity REQUIRES some kind of Higher Power. Truth is only truth because it's ALWAYS true.
Without some kind of God, though, who decides what's true? You? I? Even if we all agree, it doesn't matter, because the whole point of truth is that it's true no matter who believes it. If you want to throw away the idea of God, I sure hope you're ready to throw away not only objective right and wrong as well, but objectivity of any kind.
And if you're throwing away objectivity, why argue here? Argument presupposes truth. It assumes that there is a correct answer to argue over and identify. The mere act of discussing things like this, therefore, implies a Creator. Simple deductive logic.