Because Christians **wrongly** believe that since they are people of good will, that Secular Humanist are too.
Another reason is that Christians are like frogs in a pot of slowly warming water. They will cook there until it is too late.
There are now entire segments of our culture where it is likely very difficult or impossible for a Christian ( who was forthright about his belief) to get a job, or earn the credential or degree necessary for the job. These segments of the culture are now nearly totally beyond the influence of Christianity. ( Two of **many** examples: university professorships and many of the arts.)
Finally, Christians think government K-12 schools are like the school they knew when they were kids. WRONG!
Studies show that 85% of Christian children who have families active in their church will leave the religion within 2 years after high school. Worse, is that huge percentages of those kids who claim to be Christian hold Secular Humanist religious beliefs that utterly disqualify them from being considered Christian.
I fear that many of the people who call themselves “Christian” in the U.S. are not Christian at all! They are really Secular Humanist in their religious beliefs.
How are you going to keep them down on the farm after they've seen...the farm?
I hadn't heard that before. Why is that?