There are already serious problems with the judicial system in every country, as shown by the prevalence of violent crime - Socialists should argue for a complete change in the way we think about the issues of justice and the origins of crime, because the use of internment (denying someone the right to move freely without obstruction) simply does not prevents deviants from committing further crimes once they completed their prison sentence, and locates crime as something that results from an individual failure to abide by social rules, whereas crime is, to varying degrees, the result of social conditions over which we, as individuals, have no control. Prison Abolition should not be restricted to the Anarchists - every Socialist should embrace this cause. We should, therefore, not oppose Sharia on the grounds that the current system is acceptable, but because Sharia would be far worse and would exacerbate existing problems.
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Admittedly, I find any kind of legal code which supports amputation of limbs - no matter how rarely - and stoning to death (see the Wikipedia entry) abhorrent, but maybe that's because I was brought up as a Christian and have therefore been brainwashed into supporting western values.
This is a rather ambiguous comment. What do you mean by "western values"? Are you saying that respect for individual freedom (from abuse, in the form of permanent bodily harm) is part of Christian theology? A brief look at sections of the bible concerning the treatment of women and homosexuals shows that the Christian faith is just as violent, if not more so, than Islam.
I don't think its fair to say that the "western" legal system is "clearly" based on "Judeo-Christian faith" at least in it's unaltered form - if this were the case, those committing adultery would be sentenced to death, but it would be acceptable to own (and mistreat) slaves. Fortunately, we have moved on since the bible was written - our conceptions of morality, and the laws and institutions which form the judicial system, are, according to the marxist conception of history, dependent on and influenced by the mode of production - the development of capitalism has resulted in the introduction of civil rights, and the displacement of law based on a literal (or partial) interpretation of christian religious texts..
Islam has not undergone theological revision in the same way as Christianity (the reformation) because Islam is found in areas which have not yet undergone economic development due to imperialism.
Freedom is not specific to any culture or religion - it is a universal value which applies to all humans.