Atheists commonly misunderstand it when Christians are critical of a primarily this-worldly and hedonic life - i.e. a life dedicated to maximizing gratification and minimizing suffering.
Atheists commonly misunderstand Christians to be arguing that a worldly and hedonic life *predisposes* a person to commit sins (where 'sins' are understood by the atheist as a list of behaviours that transgress the moral law).
But this is a misunderstanding of the Christian belief about the nature of sin.
The Christian perspective is that to live a this-worldly and hedonic life - a life orientated primarily toward personal gratification - precisely *is* the state of sin.
And if the atheist does not understand what the above means, then he does not understand the Christian message, and is arguing against a Straw Man.
