It’s not about knowing/not knowing. Religion has turned faith (in God) into a virtue. That’s about all there is to it
This is a good segue into faith.
Faith is a trust you place in something that you really have no knowledge about or rational reason to do so.
When you first step on an airplane and you’ve never flown before and have no understanding of the physical laws that allow flight, that’s faith. When you trust a politician to fulfill his campaign promises that is faith. When you trust what someone else claims about something you have no experience with, that is faith.
Sometimes you have to risk a “leap of faith” in trusting what someone claims to be willing to act/perform an activity in order to gain knowledge about something.
Faith is necessary for the novice as a starting condition to gain knowledge. You have to have faith in your teachers because of your ignorance. However faith has to be replace with experience, knowledge and understanding. Otherwise the teacher is abusing and misusing the faith of the student.
Also the teacher has to have knowledge and expertise in order to teach. If a teacher/preacher themselves is still relying on faith, then that is nobody you want to learn anything from because they really have nothing to teach.