I am going to start a thread comparing the Septuagint to the Masoretic text.
For those who do not know what the Septuagint and the Masoretic text are, here's an introduction on Wikipedia:
https://en.wikipedia.org/wiki/Septuagint
https://en.wikipedia.org/wiki/Masoretic_Text
I think that, more than anything else, the fact that the Septuagint and the Masoretic text are so different, is what made me stop believing in the Bible.
Since the New Testament writers quoted from the Septuagint, not from the Masoretic Text, one would think that the Septuagint should be in all the current Bibles, but the case is that most Bibles today use the Masoretic Text as the basis of their Old Testament. But using the Septuagint would be a disaster for Jehovah's Witnesses, given that the major objection that Jehovah's Witnesses would have to it is that YHWH DOESN'T APPEAR AT ALL IN THE SEPTUAGINT.
Some people have said that the Dead Sea Scrolls confirm the authenticity of the Masoretic Text. Not so! In many cases the Masoretic Text, the Dead Sea Scrolls, and the Septuagint say different things, sometimes the Dead Sea Scrolls (hereafter called DSS) align more with the Septuagint (hereafter called LXX) than the Masoretic Text (hereafter called MT).
I haven't found something like this online anywhere else, a text-by-text comparison of the entire Septuagint, trying to find the major differences, so I will start it here.