The violent passages in Leviticus, among others, seem to me an example that Jewish and Christian laws aren't fundamentally different from Islamic ones when mixed with state law.
I fully concurred with your initial post, inasmuch as their have always been a range of different
madhabs of jurisprudence in classical Islam, with a diversity of theological perspectives on certain moral matters, based on the sunnah (or in some cases using '
itijihad', the independent method of reasoning), some more moderate and others harsher.
Thus, to take one key example, early Qur'anic exegetes such as Ibn ʿAbbas, ʿAtaʾ b. Abi Rabah, Mujahid b. Jabr, and Muqatil b. Sulayman had all firmly maintained that Qurʾan 2:190 unambiguously forbade the initiation of military hostilities and thus of 'offensive jihad'. Whereas, some ulema and jurists from the 9th century onwards like al-Tabari, al-Shafiʿi (d. 202/820) and al-Mawardi (d. 450/1058) endorsed the principle of offensive jihad.
And so, if you have an Islamic theology shaped more by the literature of these earlier interpreters, then it would be much more 'peacable' and non-confrontational, whereas one influenced by al-Shafi'i might promote a relatively more militant interpretation of the Sunnah (though still interpreting the nonaggression clause in this verse as prohibiting harm to non-combatants).
However, I think that a simple exercise in 'relativism' between religions (i.e. they're all the same, pretty much) isn't anymore helpful than one that mistakenly takes the most hard-line strains of Islamic thought to be normative for the tradition as a whole. And this is because, a relativistic stance glosses over fundamental differences in theology that quite thoroughly distinguish these religious systems.
Many posters in this thread have referred to '
Christian law', as if there were such a legal phenomenon within the New Testament or the later patristic tradition, analogous in nature to the shariah (divine positive law) derived from the Qur'an and Hadith in Islam. But there isn't any such analogue in orthodox Christianity.
Some Christian societies have implemented all manner of nasty and repressive stuff.
But there are no 'laws' in the New Testament which mandated the burning of heretics as some medieval Christian societies did, the hanging of adulterers and murderers, the public humiliation of thieves and liars, or the proscription of festivals. Why? Because of a fundamental theological point:
"
He has abolished the law with its commandments and ordinances" (
Ephesians 2:15-17)
"
having canceled the written legal code, with its regulations, that was against us and that stood opposed to us; he [Jesus] took it away, nailing it to the cross" (
Colossians 2:14)
The New Testament is devoid of a divinely ordained legal code like Shariah or Torah that God has purportedly revealed for society, so the Church had nothing to point to other than secular law or Mosaic law (which was abrogated criminally, civilly and ceremonially for Gentile Christians) for civil, criminal etc.
It had no divine laws for the state "revealed" from God in the New Testament or Sacred Tradition to source from but rather had to appeal to natural law mediated through reason and conscience for lawmaking, illuminated by revelation ethically.
I think its unquestionable that Jesus's approach and purpose were quite different from Moses, Muhammad and Baha'u'llah in this regard. Jesus cannot be described as a "lawgiver" like them. The church father St. Ambrose of Milan noted that: "
the wise man is always free...the just man is a law unto himself, and he does not need to summon the law from afar, for he carries it enclosed in his heart" (
Letters 54) and St. Clement of Alexandria: "
virtue can come only through voluntary choice. The law assumes this from the outset" (
Stromata 2:2).
Which is not to say he had no
teachings on society - in fact the lion's share of the gospel is concerned with his thoughts on rich and poor, the reversal of fortune that should come with those at the top of society brought low and the meek raised, the inclusion of the marginalized and those on the fringes of society like prostitutes and lepers, up etc. There is a strong socio-political message: its
social,
moral and
political but crucially
not legal. One would need to jump through exegetical hoops to try and tease some kind of rudimentary law out of Jesus's dominical sayings and parables in the gospels, because it really isn't there in the first place.
To quote the former Pope Benedict XVI, from an address to the German Reichstag in 2011:
Apostolic Journey to Germany: Visit to the Federal Parliament in the Reichstag Building (Berlin, 22 September 2011) | BENEDICT XVI
In history, systems of law have almost always been based on religion: decisions regarding what was to be lawful among men were taken with reference to the divinity. Unlike other great religions, Christianity has never proposed a revealed law to the State and to society, that is to say a juridical order derived from revelation. Instead, it has pointed to nature and reason as the true sources of law – and to the harmony of objective and subjective reason
(continued...)