I haven’t gotten to the stuff about intolerance toward infidels yet. But isn’t there a similar intolerance towards gentiles by the Old Testament?
Also I think a better comparison would be the Quran and the Doctrine and Covenants. The Quran was not a historical record that was found and translated. It is a collection of revelations to the Prophet Muhammed. They aren’t even in chronologial order, just in order of length.