Protestantism is the largest grouping of Christians in the United States, with its combined denominations collectively comprising about 43% of the country's population (or 141 million people) in 2019.  Other estimates suggest that 48.5% of the U.S. population (or 157 million people) is Protestant. 
Significant minorities of Roman Catholics and Jews did not arise until the period between 1880 and 1910. Altogether, Protestants comprised the majority of the population until 2012 when the Protestant share of U.S. population dropped to 48%, thus ending its status as religion of the majority.
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May 24, 2017 · Protestantism, with its emphasis on the belief that human beings can access God as individuals, flourished in a nation that celebrated democracy and freedom. During the period of British colonization, especially following the so-called Glorious Revolution of 1688, Protestantism went hand in hand with British concepts of political liberty.
- John Fea
Jul 10, 2021 · The report pointedly states: “Since 2006, white evangelical Protestants have experienced the most precipitous drop in affiliation, shrinking from 23% of Americans in 2006 to 14% in 2020.” White...
Protestantism, Christian religious movement that began in northern Europe in the early 16th century as a reaction to medieval Roman Catholic doctrines and practices. Along with Roman Catholicism and Eastern Orthodoxy, Protestantism became one of three major forces in Christianity.
Protestantism is the largest grouping of Christians in the United States, with its combined denominations collectively comprising about 43% of the country's population in 2019. Other estimates suggest that 48.5% of the U.S. population is Protestant. Simultaneously, this corresponds to around 20% of the world's total Protestant population.