McKinsey's Very first scripture reference is wrong. And it is taken out of context. there is more after that. You can't just take part of something, ending it to where it says what you want it to say. That's true in all things, text books, scientific journals, conversations and scripture.
If you read on, Jesus says that it is impossible for a man to enter heaven on his own (works), but that all things are possible with God.
If the very first point in the essay is full of flaws, one must assume the whole work is contaminated and it must be thrown out.