Hidan hailed from Yugakure. After it deteriorated from a shinobi village to a tourist site, Hidan became infuriated with how things were turning out. He believed that the shinobi that resided there were meant to kill, and thus slaughtered his neighbors before leaving Yugakure, and joining the cult-like faith known as Jashin, a religion that worshipped a deity of the same name. The primary teaching of this faith appears to be outright slaughter, where anything less than utter destruction is considered a sin. The amulet around his neck was a symbol of Jashin, and he used it to pray to his god before battling, requesting a good kill, or (when he was not allowed to) for forgiveness. Eventually, he joined Akatsuki after seeing Kakuzu, a man who he saw as a pioneer in immortality, and he was later partnered with him. Pain stated that his reason for joining Akatsuki was "religion".