The disciples are not thinking spiritually. They should have known that there was more to the Lord’s words than the obvious meaning, which even they could see made no sense.
We too sometimes struggle with the word of God and fail to understand it for the same reason. We are not approaching it as a spiritual book. That does not mean that it is written in code, or that everything has to be translated into some other meaning, as if there is no literal sense and it is all one great allegory. No, the allegorical portions of the word of God are limited, and we always pay attention to the type of literature we are reading. But when the literal sense is ruled out by some simple impossibility, as here, we look for a spiritual sense.
It is possible to ‘touch’ Christ by coming into contact with his people, his message, growing up perhaps in a Christian family, and yet never really touch him. Faith is what matters, not physical geographical nearness or familiarity with the Bible, or with the ways of evangelicalism. There must be a personal touch.