Your claim of parsimony is completely debateable.
Occam's Razor. Hitchens's Razor, come to that.
You are claiming that delusion on his part is more likely.
Yes. We have many, many, many, many demonstrable examples of deluded people. We have no demonstrable examples of alleged sons of alleged gods.
Lewis discusses this anyway. The thing is are people more likely to be taken in by a sincere madman or a calculating con man or either since the claim is the same. The question remains here. Is believing that when people look at you they are looking at God compatible with great moral teaching?
Why wouldn't it be?
At the end it matters not Lewis divides those correctly between those who are prepared to consider that Jesus may actually be who the gospels and epistles purport him to be and those who do not.
He has little time with those trying to say ''He was a con man but a great moral teacher'' as I suppose you do to.
Correct albeit for different reasons, because I don't think he was either a con man or a particularly great moral teacher. You don't seem to be able to bring yourself to say why, when Lewis flatly asserts that nobody can regard Jesus as simply a great moral teacher and just that, ruling that option out of court, anybody has to accept his fiat. Who made him the authority - which he poses as - on how anyone is allowed to view Jesus?