It is anecdotal but I used to be incredibly stubborn until i met some good teachers and mentors.

I guess when you say stubborn you mean that you tried to be independent and didn't listen to other people. That's not the issue with the person who's religious because most of his friends are religious.

Now i think the burden of proof lies on the claim that, despite our apparent similarities, a large portion of humans are incapable of being reasoned with no matter how good the teacher or delivery.

A good teacher who teaches well can get a lot of people to adopt a specific belief but that doesn't necessarily mean that the students get the belief through "reasoning". If the teacher would teach a different belief on the concept he would also get that accross.

Now i think the burden of proof lies on the claim that, despite our apparent similarities, a large portion of humans are incapable of being reasoned with no matter how good the teacher or delivery.

What evidence do you have that education in fallicies or biases helps people think better? There seem to be many people who want to believe that's true but as far as I know the decision science literature doesn't consider that belief to be true.