What exactly is the problem?
You were 'shown' some notes that are 'apparently' crap, from this I take it that you yourself have not attended any of the classes, so I fail to see how you can be convinced that anyone is preaching anything.
Having quotes on things is by no means a unique idea - quotes appear on many things, and if this particular theory provider happened to choose to add (presumably relevant) quotes to his theory notes then good on him. If he happens to choose quotes from not Shakespeare or the Wright Brothers, but from a particular book which most people in this country are at least aware of, isn't that his perogative?
If you don't agree with the quotes, don't take them to heart - but by the same token don't automatically decide they have no value merely because they come from someones religion.