6.8 million (or 7.9% of the total population) are practicing buddhists, 5.7 million (6.6%) are catholics, 1.4 million ( 1.7%) are adherents of hao hao, 0.8 million (0.9%) practise Caodaism, and 0.7 million (0.9%) are protestptant. In total,15,651,467 vietnamese (18.2%) are formally registered in a religion.