Salam. There are a few things about your reply that I want to address, but I'm starting with the most concerning part. You say that you consider the idea of apostates being executed an acceptable opinion. You also say that the entire range of acceptable Islamic thought must be defended. So the concept that apostates must be killed should be defended? This, with regards to basic human morality, is barbaric and wholly unIslamic.
Perhaps my understanding of your words is not what you meant to convey. If this is the case, then you should have phrased your words more accurately. I am simply demonstrating something that, with all due respect, I find often in your posts: you phrase things so that it seems like you're broadbrushing followers of certain ideologies, and disregarding the fact that it is not black and white. I believe there are certain aspects of the West that are destructive and some that are beneficial. Complete Secular Liberalism may be destructive, but Western democracy is not an entirely deficient system. As this is not a political forum, I'm not going to elaborate here.
I do like the fact that you point out the inconsistencies in the way the West generally presents itself, and the way it repeatedly violates the principles it allegedly upholds. Institutionalized racism, apparent "freedom of speech", and hazily impractical ideas of "anything goes" have all undermined ideas that the West usually claims to uphold. But then again, Western civilization is not a monolith.
I also agree that Muslims allying themselves with American Liberals are ignoring important aspects of both sides. If they were to examine their religious views, they would find them to be in opposition with Liberalism, but both sides choose to ignore this. It's like LGBT protesters holding rallies against Islamophobia. It's nice that they want to help Muslims, but their ideologies cannot reconcile, and neither of them recognize this. I feel sorry for both groups. (Whether homosexuality is prohibited by the Quran is a different matter, one that I do not plan to get into right now.)
At the same time, (this might be just me, I don't know)--I can't stand the idea of allying myself with followers of certain (mis)interpretations of Islam. Stoning as a punishment for adultery, for instance, is essentially a mainstream view held by most Muslims, but I simply cannot defend it, or ally myself with someone who does. I can't ignore differences like that. Basically, I find Quranic Islam to be largely incompatible with mainstream Islam AND with most of the West. Both mainstream Islam and certain Western systems of governing are fraught with numerous (sometimes horrendous) inconsistencies that render them incapable of laying the groundwork for civil society.
You have said that you want to "establish a caliphate". How would you do that? Implementing Quran-based systems of governing might work, but implementing traditional sharia would be suicide.