Sometimes I do try to curb my biases. I'm not always successful, but I do try.
And you're right. Only one point of view is not, necessarily, correct. Subjects which teach subjective matter, such as English literature, psychology, etc., should portray multiple points of view. Objective subjects, on the other hand, should be required to teach the "approved" material, with the approval coming from those who have spent their lives studying it.
Would you want to attend an astronomy course with the curriculum determined by a flat-earther? Should a lawyer decide which laws of physics are applicable? (You knew this one was coming

) Should biblical literalists determine the subject matter of a biology course? I don't believe any of these situations should occur, yet they happen all the time.
And to be fair, I also don't think an atheist would be acceptable laying out religious instruction. Although, I've seen some atheists who are far more informed of some religious belief systems than those who profess to be believers. Maybe a course in comparative religion should be taught by an atheist.
The point it, there are some things which cannot be decided by uninformed individuals. Let the experts determine what is right. Instead of allowing school boards decide what should taught in biology or geology or algebra classes, let the biologists, geologists and mathematicians decide. They are the ones who would know, after all.