I think Sharia law in a familial setting is not appreciably different than halacha is for Jews. It's got its own set of problems, but those tie back to larger issues with religion in general. And it's certainly not something society at large needs to be too worried about.
The Clarion Project contains one or two Luney Tunes but it also shares a platform with moderate Muslims.
I think you're downplaying their looniness. They've produced a number of anti-Muslim films totally in line with the worldview of the likes of Gaffney and the gang. They're also funded by right-wingers and are linked to ultra orthodox Jewish groups in Israel. If you didn't look into these things prior to posting this thread, that's fine - but on balance, they are simply not a credible or honest source. Even if some of the people they work with are well-intentioned.
Islam does change according to the societies it lives in. Christianity took nearly 2,000 to reform itself and there are still some fanatics here and there.
I'd say that's a bit of an understatement. Christian fanatics may be few and far between in Western Europe, but that's certainly not the case in some regions of the U.S. And in parts of the world where the rule of law is less stable you'll find Christians just as nutty as their brethren from the days of yore. As I said, Christianity didn't change. The world around it did.
The problem is there are several areas in Islamic countries where there are severe abuses of human rights, which the Honor Diaries activists are campaigning against.
In the UK Sharia courts are perfectly legal under the Arbitration Act. Judgements must however not violate the persons rights in English Law. There are some reportedly rogue courts but the Muslim Arbitration Tribunal (MAT) consults with English Law experts. I have posted threads on this in the past.
That's fine, but the fact that so many of Clarion's people are involved in it is a huge red flag, and the laser-like focus on Islam as the source of these problems, ignoring other factors or similar problems in non-Muslim countries, smacks of an agenda.