I take it that you cited the Hadiths for rhetorical purposes and not because you think that Muhammad actually said and did those things? There’s certainly a trend in revisionist scholarship to, not necessarily deny the existence of Muhammad, but to question the reliability of the traditional accounts. There’s the theory that “Muhammad” was at one time a title for Jesus, as it means “praiseworthy”, from the root حمد (hamad, “to praise”) + the prefix م (mu-) added to verbs to create nouns and adjectives. Evidence for this can be discerned when looking particularly at the early Islamic period, i.e. under the Umayyads; the Qur’an, numismatics and archaeology, such as the inscriptions on the Dome of the Rock.
For example, Sura 7:157 says: “Those who follow the Messenger, the unlettered prophet, whom they find written in what they have of the Torah and the Gospel… it is those who will be successful.” This verse is believed by Muslims to be referring to Muhammad, a 7th-c. Arab prophet who was allegedly illiterate, hence he is shoehorned into various verses of the Bible. However, this Surah could be referring to a passage in the Gospel of John which says: “But when it was now the midst of the feast, Jesus went up into the temple and taught. The Jews therefore marveled, saying, “How does this man know letters, having never been educated?” (7.14-15) The “unlettered prophet” one finds in the Torah and the Gospel is none other than Jesus himself.
Also from the context of the inscription on the Dome of the Rock it can be deduced that the phrase “Muhammad (praiseworthy) is the messenger of God” in the Shahadah is a reference to Jesus, as most of it reads like a polemic against the deity of Christ. The inscription is as follows:
We can see that the inscription starts by saying “there is no god but Allah” and then says “Muhammad is the servant of Allah and his messenger”, the fundamental portions that constitute the Islamic creed. However, what follows is entirely about Jesus Christ, saying to the “People of the Book” that he “was only a messenger” and should not be associated with God. Moreover, it calls him Allah’s messenger and servant, which is what it says Muhammad is. So if we read it as “Praisworthy is the servant and messenger of Allah”, then the inscription becomes consistent and is entirely about Jesus and the negation of his divinity.
The Muhammad of the Sira tradition is probably not an entirely fictional character, but moreso a composite of Jesus and an early Muslim king like Abdul Malik, the one responsible for the Dome of the Rock. Even in the earliest biographies of Muhammad such as that of Ibn Ishaq, one can immediately notice the parallels to the life of Jesus. In his book “Mohammed and Mohammedanism”, Sigismund Koelle cites many other obscure Arabic texts that attribute qualities of Christ to Muhammad, including his pre-existence. Even in the Hadiths, you find such narrations as this: “They said: 'O Messenger of Allah! When was the Prophethood established for you?' He said: 'While Adam was between (being) soul and body.'” (Tirmidhi 49.5)