The Japanese have strong traditions and religious beliefs. I think the problem is more to do with the strict upbringing they have to deal with than the religious problem.From childhood, they learn that they must live by the rules of being the best, getting into the best university, studying hard, honoring the family name etc.Society puts too much pressure on their shoulders and when they dont achieve their goals, when they fail, they lose hope and the easiest way outfor them is to commit suicide.