To respond to the original question of this thread:
In my own research, and after interviewing learned people surrounding all the issues, I have come up with my own opinion which will likely be unacceptable to most "Muslims". I say Muslims in inverted commas, because according to my understanding, there are no real Muslims.
This is only a little bit different from my complaint that there are also extremely few real Christians in comparison to the hordes that claim the title. In Islam it is far more straight forward: there are 5 requirements to be a Muslim, and every so-called Muslim can even recite these 5 requirements, there is one requirement which every so-called Muslim overlooks, and takes it just as a given, and if you ever interview and ask questions about it, you get very poor reasoning in reply, and very poor excuses, and very feeble double-speak.
Generally 'Islamic' culture is very straight forward and honest, but no-one likes to admit that they aren't a real Muslim: so "Muslims" are very eager to forgive their poor reasoning for the Injil requirement, because the burden is out of their hands, and exists apart from their tradition. They attempt to fix this issue by pretending its already built into their tradition, they will say: the Injil is just a book, and it was corrupted by the Christians, so the Injil only exists inside the Quaran. This is an utterly and demonstrably specious rationalization: because then why would there be two separate requirements, to believe in the Injil, and the Quaran is from God.
And some might say, yes, we don't know the Injil, but we still believe in it- so they claim the requirement is being met... to me it is a very sore and telling blind spot that lets themselves continue to live with a crafted sense of integrity. There are some honest groups of Muslims who do sometimes go on religious quests: in search of the Injil, and they survey Churches to try and find it, some will even just settle on a particular translation of a Bible, read that translation and call it that (sometimes this happens because they ask a "Christian": Can you tell me how to get the Christian Gospel?
And the Christian will hand them Bible or point out a Bible they call the Gospel, and so then the so-called Muslim has found an easy way out, especially if the translation is an oversimplified perversion of the Scriptures). Some who have chosen the KJV actually read it because they are commanded to believe in it, in order to achieve the status of a real Muslim; and then they realize, because they read the whole thing, trying to piece together a clear understanding of what it tells them to do, going through it painstakingly to make sure they are matching up with everything that is commanded, through the way its being explained in the new testament (something that "Christians" very rarely get around to doing), they realize that the philosophy is very very sophisticated because its all about weighing motivations, and how those motivations relate to the appearances of reality, and not how physical reality relates to intentions: and the complexity makes it clear that the book is not enough, they need someone who can piece together the doctrine, the doctrine which the book itself says, is the true Gospel. Whats more, the word Injil doesn't mean book, it means Gospel (these things are not synonymous, the Scripture talks of the Gospel, but the written word is dead because literal words can never themselves contain the Gospel). The problem is, its very hard to take on the KJV and intellectually get a 100%, and usually when people go deep enough, they know it contains a complete understanding of very crucial spiritual dynamics, but they can't access them;- but exceptionally few so-called Muslims get anywhere even near this: they notice that most people in the Islamic world, and even some of their peers, have a lot of family who will never search and study the Injil, it is a decadent quest for a spiritual elite in some small sections of Islam, and its hard to take seriously, because of how little consideration its given in the traditional systems of Islamic belief, that has always told them its pointless to look, by some craft of reasoning that has assuredly taken over the title of Islam, a religion that measures success in its progress toward the world's conversion, and to take seriously the search for the Injil,- is to admit that the that state of World Conversion is a rather meek form of hopefulness when taking this requirement as Gospel (because of revising the number of real Muslims accordingly).
The problem can be put simply as there is no separation of mosque and State in Islam, while there is the separation of church and State in Christianity.
This has huge ramifications. It means Christianity is not totalitarian and is friendly to liberal democracy, and it means Islam is totalitarian and hostile to liberal democracy.
Unfortunately we don't want to face these facts of religion, and desire a Pollyanna view of life, so we must continue to fool ourselves that we live in a world suited to our desires.
For centuries Europe belonged to the Pope-Emperor of Christiandom, who could declare war on behalf of Christiandom, and mark royalty for their disobedience, so they would be quashed by the pious rulers who took direction from the head of the faith, and also the Pope's instructions when they were issued. This lasted till the cultural shift that was Protestantism: just after it had proven itself a survivor of the many totalitarian moves taken to smother it. "Islam" is today somewhat analogous to so-called Christianity before the motions toward the great Reformation.