For what reason do you think the bible was written?
I don't think much about it to be honest. I don't feel like I have to have any justification for any of it simply because I don't believe in the Bible as "the word of God" or "sacred" or any of that. To me, asking for a reason for the Bible to be compiled (and it's a compilation of writings, not some one-time deal by one author), is like asking why today's supermarket shopper was printed. Who knows, who cares. I see no difference.
Jesus did exist. A man who either wanted power over people or had some
sort of psychosis or other mental health problem that lead him to
believe he was the son of the creator of all things.
It is well documented and never refuted by me (as an atheist) that Jesus of Nazareth was a real person. He existed. Before anything else, please bear in mind that I am just one atheist. There's a wide misconception that atheists are all somehow united in the same way of living, thinking, acting or believing. That's very inaccurate. Atheism is not a religious denomination and should not be thought of or dealt with as such.
With that out of the way, historians, archaeologists and all other related scientists have confirmed that Jesus of Nazareth did live where the Bible and other writings from his era say that he did. To me that's indisputable. Now, Jesus the son of God, turning water into wine, resurrecting people, resurrecting himself, reigning Earth for 1,000 years, none of that is true to me. Furthermore, and actually even the WT wrote something about it, during that time, there were many others claiming to be the "Messiah"; it was a trend at that time. Jesus of Nazareth happened to be the one who became famous for it.
If someone today believes they are the son of God or Satan or whoever,
no one would believe them. They would be treated for mental illness.
Actually, I wouldn't say that categorically. In fact, the reasons why organizations like the WT exist is precisely because of their claim to be directly connected with their Jehovah, and because of them claiming that they are the one and only organization directly connected with their Jehovah.
Furthermore, those and similar claims are textbook cases of manipulation and control of the masses. As crazy as it sounds, there always is(are) someone(s) who believe whatever claim some person makes. That's the oldest trick in the book.
Without getting into the science and research for that effect, I can assure you that there are in fact people out there who, with and without any type of mental health issue, claim to be Jesus, or "chosen" by Jesus, etc. Gazillions of books have been written on this specific matter.
Thank you for your post. It's a very interesting topic.