Answering Christianity Research Center

So i've heard this claim a few times now and i really don't understand where it comes from. Some christians claim that prophet Muhammad pbuh sent letters to kings saying that jesus pbuh is God astaghfirullah.
Does anyone understand this topic or where it comes from?

Abu Hurayrah reported that the Prophet said:“The (Hell) Fire complained to its Lord saying: 'O my Lord! My different parts consume each other, so allow me to breathe.' Therefore He (i.e., Allaah) allowed it to take two breaths, one in the winter and the other in summer, and this is the reason for the severe heat and the bitter cold you find (in weather).” [Al-Bukhaari]

Reference : Sahih al-Bukhari 3260
In-book reference : Book 59, Hadith 70

So on youtube, i found someone asking this "I would be interested in knowing if you can find a single example of DAHAHA being used in classical Arabic literature in the form of a verb meaning "to make shaped like an egg"."

so this question has been asked to me by a muslim recently and i'm not sure how to respond

Narrated Anas:

When 'Abdullah bin Salam heard the arrival of the Prophet at Medina, he came to him and said, "I am going to ask you about three things which nobody knows except a prophet: What is the first portent of the Hour? What will be the first meal taken by the people of Paradise? Why does a child resemble its father, and why does it resemble its maternal uncle" Allah's Apostle said, "Gabriel has just now told me of their answers." 'Abdullah said, "He (i.e. Gabriel), from amongst all the angels, is the enemy of the Jews." Allah's Apostle said, "The first portent of the Hour will be a fire that will bring together the people from the east to the west; the first meal of the people of Paradise will be Extra-lobe (caudate lobe) of fish-liver. As for the resemblance of the child to its parents: If a man has sexual intercourse with his wife and gets discharge first, the child will resemble the father, and if the woman gets discharge first, the child will resemble her." On that 'Abdullah bin Salam said, "I testify that you are the Apostle of Allah." 'Abdullah bin Salam further said, "O Allah's Apostle! The Jews are liars, and if they should come to know about my conversion to Islam before you ask them (about me), they would tell a lie about me." The Jews came to Allah's Apostle and 'Abdullah went inside the house. Allah's Apostle asked (the Jews), "What kind of man is 'Abdullah bin Salam amongst you?" They replied, "He is the most learned person amongst us, and the best amongst us, and the son of the best amongst us." Allah's Apostle said, "What do you think if he embraces Islam (will you do as he does)?" The Jews said, "May Allah save him from it." Then 'Abdullah bin Salam came out in front of them saying, "I testify that None has the right to be worshipped but Allah and that Muhammad is the Apostle of Allah." Thereupon they said, "He is the evilest among us, and the son of the evilest amongst us," and continued talking badly of him.

Bukhari :: Book 4 :: Volume 55 :: Hadith 546