What truth are you referring to? I guess we should just take this metaphorical thing one step further, and just say god is a metaphor too, and the whole thing is fictional, and the anonymous authors had their own agenda.
Arabic sources for the life of Muhammad are very late, tendentious, and unsupported by any archaeological or epigraphic evidence, while the non-Islamic sources are scant and ambiguous.
This thread is not about Muhammad's non existence.
Luke 19:27
But those enemies of mine who did not want me to be king over them--bring them here and kill them in front of me.
Luke 14:26
If anyone comes to me and does not hate father and mother, wife and children, brothers and sisters--yes, even their own life--such a person cannot be my disciple.