That is a nice set of questions right there. How separate should one be perceived from the other, and why?
I am not sure that I correctly understood the question, and I don't know if that answers the question, but the prophet once said no one of you will be a believer until he loves for his brother what he loves for himself. According to some scholars, we are talking here about brothers in humanity, and not only brothers in Islam.
To which extent is Islam not the collective result of Muslim practice? If they are not one and the same, then why does Muslim practice matter?
As you know, we have the Quraan as the revealed Word of Allah to our prophet Muhammad peace be upon him. And Allah has chose prophets to share the message with humanity to worship Allah alone.
With that said, we should know that the sources of Islam are both from the Quraan and from our last prophet Muhammad peace be upon him. So no matter how many muslims do a thing, if it is not Quraan or Sunnah supported than it is not Islamic.
As portrayed in the Quraan and from the Sunnah, one can't be muslim enough because being a muslim 100 % means being perfect.
Sure you would find some violence and fighting back verses, but this is only because it is part of life. One will face some occasions when he is expelled out of his country for example. Fighting in that case for example, is not forbidden, as indicated in the Quraan. (this is just an example)
It is very much a Theistic, Abrahamic Faith. One that holds scripture in high regard. And one that assumes that everyone would convert ("revert") to it if it only gave the Quran and the Faith a fair chance at that.
As for scripture, it is because Quraan is the Word of Allah revealed to our prophet Muhammad peace be upon him and as you know Islam is all about worshiping God alone and associating no partners. God is the Almighty, the only perfect one. So we hold his Words in the highest regards.
As for expecting everyone to convert/revert, Do you think that God being the Creator of everything and the All knowledgeable doesn't know us. He knows us better than we know ourselves. Based on that, any thing from God is the right thing.
As for the "fair chance" part, God makes it clear through out the Quraan that things won't be easy and that people, even strong believers won't have an easy life, it is on the contrary.
chapter 29
2 Do the people think that they will be left to say, "We believe" and they will not be tried?
3 But We have certainly tried those before them, and Allah will surely make evident those who are truthful, and He will surely make evident the liars.
4 Or do those who do evil deeds think they can outrun Us? Evil is what they judge.
5 Whoever should hope for the meeting with Allah - indeed, the term decreed by Allah is coming. And He is the Hearing, the Knowing.
6 And whoever strives only strives for [the benefit of] himself. Indeed, Allah is free from need of the worlds.
7 And those who believe and do righteous deeds - We will surely remove from them their misdeeds and will surely reward them according to the best of what they used to do.
Despite the fact that if it were easy or hard, God always asks people to believe in Him for this life is nothing and just a short time and the purpose of it is going to the eternal life after our death.
6:32 And the worldly life is not but amusement and diversion; but the home of the Hereafter is best for those who fear Allah , so will you not reason?
Which is to say, it is not for me, and it can never be a good fit for many people.
Should we discuss the reasons and see why it is not a fit?
How much of a conviction that converts are actually reverts do you have, and why?
There is a hadith saying Abu Huraira reported: The Messenger of Allah, peace and blessings be upon him, said, No one is born except upon natural instinct, then his parents turn him into a Jew or Christian or Magian.
Also Quraan 30:30
So direct your face toward the religion, inclining to truth. [Adhere to] the fitrah of Allah upon which He has created [all] people. No change should there be in the creation of Allah . That is the correct religion, but most of the people do not know. ( fitrah is like instict).
So we believe that God created all people as believers. This is the instinct inside of them, because as you know Islam is all about worshiping God and God alone. So one that happens, you feel in peace with yourself because that is your instinct, this is how Allah created you.
Because it demands belief in God and centers its doctrine on that belief.
Would that be not a problem if it were proved to be true?
Because it holds scripture in such high regard.
Doesn't it deserve to be in the highest regard if it is the Word of your Creator?
Because it expects everyone to be capable of belief in God or to benefit from it.
Benefits in this world is living in peace and having answers to questions and in in the afterlife it would be eternity in heaven. It explains our purpose. However, God never told us that it would be an easy rode in this life to do so. But God promises to facilitate us a way if we seek Him.
If you like watch this video
https://www.youtube.com/watch?v=4anqkegYklQ
Because it thinks of disbelievers as sinners.
Sinners would be those people knowing the truth but rather choosing not to believe. There are rights towards the creation and right towards the Creator. However there are some people who it was simply not there fault because they were not approached the right way or were never approached by the subject. For those people will have their own test later. However, God will judge each one accordingly for He knows intentions of people and knows each person.
Because it separates the religion from the practice.
I did not understand what you mean by that?