Or, maybe the preacher is more interested in the collection plate and he believes that if he preaches anything controversial, he will lose some large contributors. A large part of the church is held in bondage because of fear of the unknown. They don't know their Bibles and they don't know about the promises of God. Rather, they rely on what others tell them. Self help books flourish and authors fill bookshelves with titles extolling every kind of human wisdom - but they do not contain the truth of Scripture.
Fear drives some to seek knowledge in places where truth is the most distorted.
New Age teachers abound with messages from ascended masters and spirit guides. I personally was introduced to the study at one of Wichita's leading evangelical churches. For many Christians caught in the web of fear, they profess faith but looks to works for their salvation for they have no faith. They judge others according to their works as well for that is their only barometer, i.e. that which they can see. They walk by sight exclusively and not by faith.