What the heck is a preacher preaching about if not what the Bible says? If that's not what he's preaching about, then he's not a Christian preacher, he's a motivational speaker, or a psychiatrist, or who knows what...
That's the problem with many churches today. The priests/pastors/preachers don't teach the Bible. Therefore their flock doesn't recognize the truth, and doesn't recognize deceipt and unscriptural teaching when someone tries to pass it off as doctrine.