Why don't professing Christians realize they have embraced secular humanism?

Les explains that the average professing Christian is in reality a practicing secular humanist. They claim to be believers and Christians, but in the workaday world they fit right in with secular humanism. The reason is not lack of brainpower; it is ignorance of the Bible. Most church members are totally ignorant of this book, knowing only a little surface-level material. Consequently, with so little biblical knowledge, they can embrace secular humanism without even knowing what they are doing. Les also stresses there is much in the Book to learn that helps in day-to-day living, experience, and good citizenship, and that young people lack a sense of right and wrong because they do not know what the Book says.