According to the 2011 National Household Survey, 67.3 percent of Canadians identify as Christian; of these, Roman Catholics make up the largest group, accounting for 38.7 percent of the population. Much of the remainder is made up of Protestants, who accounted for approximately 27 percent in a 2011 survey. The largest Protestant denomination is the United Church of Canada (accounting for 6.1 percent of Canadians), followed by the Anglican Church of Canada (5.0 percent), and various Baptist sects (1.9 percent). Secularization has been growing since the 1960s. In 2011, 23.9 percent declared no religious affiliation, compared to 16.5 percent in 2001. Islam is the largest non-Christian religion in Canada, constituting 3.2 percent of its population. It is also the fastest growing religion in Canada. 1.5 percent of the Canadian population is Hindu and 1.4 percent is Sikh.