Christianity, and specifically Protestantism, is the most prevalent religion in the United States, with 65% of polled American adults identifying themselves as Christian and 40% holding a strictly creationist view in 2019. The percentage of Americans who identify as Christian has trended downward since the late 1970s. In a 2015 survey, 75% of adults in the United States identified as Christians, 70.6% in 2014, 78% in 2012, 81.6% in 2001, and 85% in 1990. About 62% of those polled claim to be members of a church congregation. The United States has the largest Christian population in the world and, more specifically, the largest Protestant population in the world, with nearly 205 million Christians and, as of 2019, over 141 million people affiliated with Protestant churches, although other countries have higher percentages of Christians among their populations. The modern official motto of the United States of America, as established in a 1956 law signed by President Dwight D. Eisenhower, is "In God We Trust". The phrase first appeared on U.S. coins in 1864.