Well, given that Matthew violated your #8 (Matt. 4:1) shouldn't you distrust the writer as a false friend of God?
So how do you know whatever he wrote is true?
Do you just pick verses that match with your own ideas of what God should be, and reject the verses that don't match with your preconceived ideas?
Aren't you in reality creating your own image of God, according to what you want him to be?
What if God is in reality an asshole? What if God would actually want us to not 'do unto others' as that enables the weak to thrive, and God actually favors the strong and selfish?
How would you know?
The way you pick and choose what suits you you could never find out. You could very well be rejecting the wrong verses without knowing.
Or maybe you're not rejecting enough ;-)
With the way you pick and choose parts that match your own ideas even the Quran, the Book of Mormon, the Scientology books and every other book is a good guide to the divine: reject what you don't like, keep the rest.
Is picking and choosing parts of an ancient book a reliable way to gain knowledge?