The 2011 German Census showed Christianity as the largest religion in Germany, with 66.8% identified themselves as Christian, with 3.8% of those not being church members. 31.7% declared themselves as Protestants, including members of the Evangelical Church in Germany (which encompasses Lutheran, Reformed and administrative or confessional unions of both traditions) and the free churches (); 31.2% declared themselves as Roman Catholics, and Orthodox believers constituted 1.3%. According to data from 2016, the Catholic Church and the Evangelical Church claimed 28.5% and 27.5%, respectively, of the population. Islam is the second-largest religion in the country. In the 2011 census, 1.9% of the census population (1.52 million people) gave their religion as Islam, but this figure is deemed unreliable because a disproportionate number of adherents of this religion (and other religions, such as Judaism) are likely to have made use of their right not to answer the question. Most of the Muslims are Sunnis and Alevites from Turkey, but there are a small number of Shi'ites, Ahmadiyyas and other denominations. Other religions comprise less than one percent of Germany's population.