Was Jesus the Egyptian Pharaoh Tutankhamun?

There is no certain evidence on the real existence of Jesus Christ and even less on the fact that he lived in the historical era told by the Gospels. Ahmed Osman instead believes that the figure of Jesus is based on the life of the pharaoh Tutankhamun.

Pharaoh Tutankhamun, who lived more than 1300 years before the Biblical Jesus, actually favored the belief in life after death and in resurrection. Even in the room where he was buried there is a painting depicting his own resurrection.

According to Osman this idea (the resurrected savior) would be the basis of Christianity; the author claims that the followers of the Pharaoh would have kept their faith secret until John the Baptist started talking about the arrival of the Redeemer. At that point the followers of the Tutankhamun cult would reveal that they witnessed the Savior's resurrection (this is what they believed) and their words were taken literally and inserted into the Holy Scriptures.
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Wanting to analyze this fascinating hypothesis, it is easy in any case to come across some similarities and coincidences:

the Egyptian Pharaohs were usually defined with the title "Son of God";
the figures of Moses and Joseph have been found several times by the historians of Egypt;
the image of the cross is also present in Egyptian symbolism;
"Amen" is often depicted in Egyptian images as "the Ram" (= the Lamb of God);
the Egyptians used to celebrate the winter solstice as the birth of Horus, their savior. The date coincides with that of the Christian Christmas;