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https://www.statista.com/topics/1737/christianity-in-the-united-states-i/

Christianity in the U.S. - statistics & facts

The United States has been Christian longer than the states have been united. Christianity was established in the early colonial period when settlers from Europe brought Christianity along with them. Many settlers, such as those who later became known as the Pilgrims, settled in the United States in order to escape persecution of their particular denomination of Christianity in Europe. 
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Share of Americans who identify as Protestant

38%

Largest Christian denomination in the U.S., by numer of adherents

Catholic

CHRISTIANITY IN THE U.S. PART I - IMPORTANT STATISTICS

• 1. Overview
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    Self-described religious identification of Americans from 1948-2017
    What is your religious preference: Protestant, Roman Catholic, Jewish, another religion, or no religion?
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    Religious identification of adult population in the U.S., as of January 2017
    Self-described religious identification of the adult population in the United States, as of January 2017
• 2. Church infrastructure
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    Largest U.S. Christian denominations 2010, by number of adherents
    Largest Christian denominations in the United States in 2010, by number of adherents
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    Largest U.S. Christian denominations 2010, by number of congregations
    Largest Christian denominations in the United States in 2010, by number of congregations
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    Largest Evangelical and Conserative Protestant churches in the U.S. 2010, by adherents
    Largest churches among Evangelical and Conservative Protestant denominations in the United States in 2010, by number of adherents
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    Largest American Evangelical/Conserative Protestant churches 2010, by congregations
    Largest churches among Evangelical and Conservative Protestant denominations in the United States in 2010, by number of congregations
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    Largest Mainline Protestant churches in the U.S. 2010, by adherents
    Largest churches among Mainline Protestant denominations in the United States in 2010, by number of adherents
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    Largest Mainline Protestant churches in the U.S. 2010, by congregations
    Largest churches among Mainline Protestant denominations in the United States in 2010, by number of congregations
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    Number of religious adherents in the U.S. 2010, by state
    Number of religious adherents in the United States in 2010, by state
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    Percentage of religious population in the U.S. 2010, by state
    Ratio of religious adherents to population in the United States in 2010, by state
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    Number of religious congregations in the U.S. 2010, by state
    Number of religious congregations in the United States in 2010, by state
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    Number of active religious groups in the U.S. 2010, by state
    Number of active religious groups in the United States in 2010, by state
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    Number of religious adherents in the U.S. 2010, by metropolitan area
    Ranking of metropolitan areas in the United States in 2010, by religious adherents
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    Ranking of religious groups 2010, by U.S. county penetration rate
    Ranking of religious groups in the United States in 2010, by county penetration rate
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    Number of ordained clergy serving U.S. religious parishes 2009, by church
    Number of ordained clergy serving religious parishes in the United States in 2009, by church
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    Religious change in members among major religious groups in the U.S. 2012
    Religious change among major religious groups in the United States in 2012, by gain and loss of members
• 3. Church finance
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    Sources of U.S. congregational income in 2008, by faith tradition
    Sources of congregational income in the United States in 2008, by faith tradition
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    Sources of U.S. congregational income in 2008, by church size
    Sources of congregational income in the United States in 2008, by church size
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    Percentage of U.S. church income from individual donations in 2008, by faith tradition
    Percentage of church income from individual donations in the United States in 2008, by faith tradition
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    Median donation per worshipper of U.S. churches in 2008, by faith tradition
    Median donation per worshipper of churches in the United States in 2008, by faith tradition (in U.S. dollars)
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    Median donation per worshipper of U.S. churches in 2008, by church size
    Median donation per worshipper of churches in the United States in 2008, by church size (in U.S. dollars)
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    Giving levels across U.S. congregations in 2008, by faith tradition
    Giving levels across congregations in the United States in 2008, by faith tradition