I see where you're going with this (I think?) but to answer your question the way you want me to, yes. You said yourself that Muslims know who Jesus is. If they study they Quran, they also know the truth about their own prophet Muhammad. The know the difference between Jesus and Muhammad and the qualities they share. From there, if they compare the attitude and actions of the God of the Bible and the God of the Quran, there is a glaring difference. They are not the same God and do not share the same qualities throughout those texts.
We are all faced with a decision. Will your questions include, "why should I go to hell if I only live to be 70 years old and spent a bunch of time being a mostly good person?" Is that muslim person you mention guilty of sin? Even one single sin? Did suicide bombing himself and taking out others in the process atone for his sins?
Brother, you are having a very hard time grasping anything that I am saying outside of an egocentric perspective.
You are treating the hypothetical muslim as a person with a christian worldview and upbringing.
If they are born into islam and spent their whole lives doing what they thought god wanted them to do then they will look at the bible and the jesus in the bible as illogical and ass backwards.
You are looking at this scenario as if christianity is the matrix that holds everything in existence together but you are failing to realize that they look at islam as the matrix that holds and explains everything, and it is YOUR christianity that is 'obviously' man-made and bullshit in that regard.
You ask me, has this muslim sinned? Hmm, I don't know does not fasting the month of ramadan count? Because they sure do consider that to be sinning.
Instead, you want this muslim whose intentions throughout his life have clearly validated that he is a conformist to 'gods' side, to be punished in hell for eternity even though he lived a measly 25 years adhering to what his environment told him were gods ways.
You want to say "well, even though he starved himself in ramadan, prayed five times a day, gave money to the poor, denied himself work opportunities because they contradicted his beliefs, and did everything in his power to please god the whole time, but because god created him in a nonchristian country with a limited amount of resources at finding the truth he should still go to hell because he "refused to hear god's servants"?
Get real dude, all he has done was 'hear god's servants'. He gave his life up doin it for christ's sake.
It is a very important step for a man to take when he begins to see the world more objectively and realizes how most of these systems of thought that exist today stand on absolutely nothing but a void; that they are self-validating at the very best(this part is true because that part validates it, that part is true because that other part says so and requires this, a huge intricate web of a belief system)
Beliefs dictate what we are able to perceive about a situation and what we can't. Change your belief and your whole identity and the world that is built from it will change instantaneously. I am speaking from a direct experience.
But no, you still want to try your hardest to glue this irrational belief system of a very inefficient god upon the world.
I know you have had 'magical' experiences which you interpreted as further proofs of christianity and I want to just say that these experiences were due to the power of our minds and the universe. It doesn't mean that they weren't real, and it especially does not mean that nonchristians do not have those experiences either.
It is interesting to note that when somebody is possessed by a devil, you can perform a christian exorcism on them and succeed. But it only takes a quick youtube search to see that a muslim exorcism works just as well. It just goes to show the power of beliefs here.
Ill stop here because this is getting too long too quick.