In the case of these documentaries, it was an issue of spiritual discernment. The only true basis for telling the lies apart from the truth is having a deep rooted factual knowledge of what the Bible says. From the Bible itself. Not from commentaries, documentaries, or authors, but the actual words of God. I studied the book of Genesis a few years ago in c.b.s. and it was amazing. These documentaries were shocking in a sense to see how fallen we are as a human race to believe these lies that have been told since the beginning of time. People warping the story of creation, and God's miracles. People giving credit to mythology and cultural stories over the true word of God in the Bible. God's word is true, and that is the only word that we should believing.
Spiritual discernment carries over into the secular Christian world as well, where things have veered off into the path of political correctness land. There is one televangelist in particular that focuses on "inner self and self-worth." The one and only time I heard a brief part of his message, I immediately recognized it as lies. He had taken a simple verse of scripture, but twisted it to mean something that scripture had not intended. It clearly says in the bible that it is a sin to add to or take away from God's word. People have also done this with current social issues. The bible clearly states what is sin. It should not be re-interpreted to say, well God really didn't mean it that way. The bible clearly states otherwise. God loves everyone, but doesn't love the sin.
In the issue of spiritual discernment it can also be tricky with religious books. The one that I felt adamantly opposed to reading a few years ago was "the shack." I have never felt more strongly against reading a certain book in my entire life. I wanted to burn it. It became an ongoing debate between myself and mil and sil about this book. So it eventually got thrown in the trash- never read it. Hardly any biblical truth, totally distorted. It would be like someone that read the 'DaVinci Code' and saying that they believed it as God's word. It's just not true. It just takes a little bit of truth, mixed with a lot of lies, to mess with people's hearts.
The best way to stay alert and aware is in reading God's word straight from the source- the Bible. Reading it, and asking God to reveal the truth of his word to us.
Sure the world or society may mock, laugh or condemn people who so passionately follow Christ in their faith, but what is so important to us in our life (fill in the blank) that it's worth losing our eternal souls over? See my old post:
http://thyoldefarmhouse.blogspot.com/2010/01/you-think-you-know-person.html that still weighs very heavily on my heart. Betrayal hurts regardless of who's involved.
