Those two statements are anything but established truths.
They are articles of faith that each person must feel free to accept or reject however they please.
If anything, I feel sorry that so many people (mostly but not always Muslims) seem to feel so bothered by the simple, unimportant fact that not everyone is meant to be a believer in God nor in the Quran. Such a situation often puts us in a difficult situation, having to choose between lying to people or hurting their feelings.
Not everyone can or should be assumed monotheistic or converted into one.
These are of course my strongly-held beliefs. And it is of course possible that I am wrong. I don't believe that I should force you to accept them. I certainly believe that it is my duty to try to guide you (and all other people) to them, and indeed you are doing something similar: trying to correct what you feel to be my misperceptions. And of course it does bother me that so many people either do not see (what I consider to be) the Truth or see it and nevertheless actively work against it (the Devil and their servants). As it perhaps bothers you that I am unwilling or unable to see your truth. But none of us should shrink from robust (though suitably respectful) dialogue about our beliefs/thoughts about the nature of Reality and how we ought to behave.