The case of Abdul Rahman, an Afghani Muslim who converted to Christianity fifteen years ago and who now potentially faces the death penalty if he does not convert back, is a perfect example of why moral and cultural 'equivalence' is indefensible.
There are those who would argue that this is a prime example of why the Middle East cannot be democratized, the same, coincidentally, who would argue that each culture's practices are just as 'good' as any other, Rahman's case is not a necessarily evidence of the former but definitely an argument against the latter.
If we believe in liberty, especially individual liberty, facing the death penalty for choosing one religion over another is beyond any reasonable defense.
I don't think Rahman will be executed. I have every confidence that if all else fails that Karzai will not sign the death warrant. The hope is that somewhere in the judiciary system a sane decision will be made, perhaps with the knowledge that the world is watching, and judging.