I mostly agree, wipe them out, but that won't happen anytime soon. But then there is a problem what do you do after with all that shit left? Just get out some other isis will prop up.
Btw, how do you integrate a culture that doesn't want to get integrated? One thing you can go russian style ala russification, but that didnt really work out and it's not really a democratic solution. This thing is a clash of cultures.
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Regardless of what is claimed, we are talking in a semi scholarly fashion, and the sourcing even for sunni scholars is weak, as explicitly mentioned in that article. As for the rest, has Muhammed ever killed anyone for apostasy? As you said the sahihs were compiled some 200 years later and there is hardly consensus around them(your environment is hardly comprehensive of the Muslim tapestry), as for the whole Aisha debate, let's throw context out the window and let's just be, well, scholarly:
Again to serious historians none of these sources are reliable. Ibn Ishaq (the biography writer) is deemed not trustworthy by many sunni scholars because he confirmed the Shiite version of events for instance. They don't discredit him at large but they discredit some of his narrations (like those about Ali).
The main point about ISIS's interpretation is that it is rooted in the tradition. Some scholars may make arguments like Adnan and others scholars will respond but both sides are Islamic and are rooted in Hadiths. You cannot say (I am not saying you do) that this has nothing to do with Islam, when the hadiths are there and biography is there and it contains such stories.
About apostasy, there are recorded hadiths in both sahih bukhari and sahih muslim of him saying that they should be killed. As long as the chain of transmition (Sanad) is 'solid' and the content of the hadith (matn) is similar then this hadith is trust worthy for most Sunni scholars. If I remember correctly, the 4 main schools of jurisprudence all agree that apostates should be put to death. They only disagree about the process prior to execution. Some say the apostate should be killed immediately, others say we have to wait 3 days to give the apostate a chance to repent before killing them. They also disagreed on who has the right to kill the apostate. Does the average muslim on the street have the right to kill apostates or is it solely the right of the Caliph? But they all agree that apostates should be killed.
About Aisha, the hadiths are pretty straight forward and are in more than one source. She even tells how she used to go to him with her toys. You can make arguments like Adnan (he is largely anti-hadiths) but again swaths of muslim scholars think otherwise and so it is an islamic practice.
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Fun fact: Bukhari says in the intro of his book of hadiths that he started off with something like 600,000 hadiths and ended up with 3000 that he judged as authentic enough (I cant remember the exact numbers you'll have to look it up). Mathematically he would have had to been collecting hadiths all his life since birth averaging something like 3 hadiths a day, in a time where there was no cars, plans or telephones. Historians spend a full year with a handful of letters to determine their authenticity. That guy was on fire in comparison. The proof that he is not reliable is in his own book
This has some of the things he is very different from the majority of scholars.
http://hubpages.com/religion-philosophy/adnan-ibrahim
