Saved by grace through faith. It just doesn't get any easier than that. Christianity is about doing less from your own volition, not more.
Martin Luther is the one that came up with this teaching. That is why Luther wanted books of the Bible to be removed. One of the books Luther wanted removed was the Book of James. Why?
"As the body without the spirit is dead, so faith without deeds is dead." - James 2:26 NIV
The Vatican removed 14 books from the Bible in 1648.
Luther made an attempt to remove the books of Hebrews, James, Jude and Revelation from the canon (notably, he perceived them to go against certain Protestant doctrines such as sola gratia and sola fide).
So, I do agree with the notion that Jesus taught that life - it's not about you. Life is about connecting and helping others. Salvation is a sticky subject. Salvation from what?
When it comes to the Bible never changing - it's changed several times over the centuries. That is not necessarily a bad thing. I believe the future of Christianity, if it is to have a future, is Integral Christianity. The mark of a person's advancement in a spiritual path is when their focus shifts from salvation to showing gratitude.
As I told a good friend - I am not a Christian. I am a follower of Christ and The Way (as Christianity was first known). What I find interesting now is that the phrase "The Way" translated into Mandarin is "Tao" as in Taoism. People who focus on salvation live a life full of fear and anxiety. People who focus on living in harmony with others and nature live a life of peace and happiness.
If the teachings of Jesus are your path, that is good! You have chosen a path. No one can choose your path for you. Now start on the path and don't stop. There are only 2 reasons people fail to reach the top of the mountain - they never start and the stop because it gets difficult.