He should not adopt an unquestioning belief of his teacher and his textbook. He studies the fact, examines the scientific arguments, and makes an assessment of the reliability of the information. If he has doubts, he should reserve his judgment until such time as when he is able to investigate the accuracy of the information for himself. To a Buddhist, confidence is a product of reason, knowledge and experience. When it is developed, confidence can never be blind faith.
Confidence becomes a power of the mind.
The moment you see, the question of belief disappears. If I tell you that I have a gem hidden in the folded palm of my hand, the question of belief arises because you do not see it yourself. But if I unclench my fist and show you the gem, then you see it for yourself, and the question of belief does not arise.