if Christian is understood 'loosely'
It is not.
It is certainly possible the author had a subjective POV which could be just about anything; we don't know,
Yes, the view developed in the corpus : Jesus is a mere man, but created by God like Adam with his Spirit . And he is the word of God, like Moses, Solomon, Hud, etc. Word of God means nothing else than telling the message of God. That's the trick of the authors in which all fall... In Christian ears , it means God. But
not in the mouth of the authors...
Look at the text : what the expression "word of god" bring to Jesus apart itself ? Nothing... it's totally empty !
So why they write it ? Haha !
To trick their public, to seduce them, that's all.
For them it means nothing. Like "masiah". Nothing.
So beliefs about the author's POV must be imposed on it, extrinsically, based on extrinsic arguments and presumptions -- they may still be valid, but they are not text-dependent.
The author shares the beliefs of the corpus : which are intrinsic , not extrinsic. And they share some belief of Christianity, of course... since they consider themselves as the
true believers against Christianity...
With (3) I agree about the anonymity and 'generic' typology that is typical of the Qur'an, prophecy is a sort of overarching theological concept that is only weakly given any specific character for any particular prophet. There is very little of any individual personality to any of the Qur'anic prophets. But I would say we need to be careful to distinguish the Qur'anic rasul from the historical Muhammad and in turn distinguish them from the Muhammad of Islamic tradition ... these are all distinct and different concepts/entities.
There is no historical Muhammad. There's only the Quran with a blank figure inside and a story beside : creation of the authors.