Here is a picture of the mass of people "witnessing" the "dancing" and "falling" Sun.
What people "see" and what really happened is often two different things. The conviction that something happened seems to grow with the crowds, and is often referred to as "mass hysteria."
This 'miracle' of the Sun was actually predicted by the "appearance" of Mary (the Mother of Jesus) to three little children in Portugal in a town called Fatima. And Mary "told" one of them, Lucia, that the Sun would do something (I guess as a sign of "authentication").
Of course, when interviewed many people, it turns out, witnessed something very different from those next to them...and some even said they saw nothing at all! All photographs of the Sun on that day show none of the "miraculous" signs predicted and duly "witnessed" not by 500 like those in Jerusalem, but 70,000, who only thought they saw something.
Using eyewitness accounts is obviously unreliable.
The author also uses a banal argument about the apostles for basically dying for their faith as a "proof" that they "saw" the risen Christ. In Mat 28:17 it says that at the end of his 40 days mingling with the disciples some still doubted Jesus.
But just because some people are ready to lay down their lives form someone is no proof that that someone is what they believe he is! Look at what Jim Jones did! He managed to convince a whole bunch of people that dying for their faith was a good thing! Look at all his followers who died for Jim Jones.
being martyred for something you believe in is no proof that what you believe in is true or real.
Sorry. Your author may be a good guy, but his arguments are not.