Utter nonsense. Requiring public schools to post the ten commandments in their classrooms is forcing a particular religion down the throat of every child, using taxpayer funds. It is advocating the value of the Bible over other religions or non-religion. If a Muslim majority school district required every classroom to post lines from the Quran, people would be outraged. Unless the class is literally studying religion or that area of history, posting religious texts is advocating that or those religions and is an act of establishing an official religion.
The Bible isn’t one book. It is a bunch of books put together. If we really want to understand it, we should try to understand what each author was saying.
Jesus was not mentioned by Greek or Roman sources in the first 100 years. And, his first Greco-Roman reference was a passing reference. Paul also tells us very little about what Jesus specifically said. Our earliest sources are the four gospels. They are not particularly reliable, but that doesn’t mean they are useless. The Gospels are not first-hand testimony, but people reporting hearsay. They couldn’t know Jesus’s exact words.
We can look at which testimony is earlier, whether one seems to be emphasizing a bias or a message rather than just telling us what happened, to what extent different sources agree with each other, and the extent that Jesus is saying something that seems like his followers would not want him to say.
Europe was the second-fiddle Christian land until Muslims conquered the heart of Christianity. The Crusades were a delayed response to these invasions as well as continued invasions of lands controlled by Christians.
Muslims from where Algeria is now, raided and enslaved Europeans for hundreds of years. Algeria demands reparations for French colonialism, but hypocritically ignores 300 years of Algerians raiding and enslaving Europeans.