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The [[Arian]]s of the 4th century denied the Trinity. They were condemned as heretics and they died out, but Arian ideas reappeared in Europe after 1500. [[Isaac Newton]] was secretly an Arian.  

The [[Arian]]s of the 4th century denied the Trinity. They were condemned as heretics and they died out, but Arian ideas reappeared in Europe after 1500. [[Isaac Newton]] was secretly an Arian.  

By the mid-18th century [[Unitarianism]] had emerged in England, and by 1800 it spread to the U.S.. By 1820 it dominated schools like [[Harvard]].

By the mid-18th century [[Unitarianism]] had emerged in England, and by 1800 it spread to the U.S.. By 1820 it dominated schools like [[Harvard University]].

In the 20th century [[Jehovah's Witnesses]] do not believe in the Trinity, and see it as contradicting the commandment to have no god but the one God.<ref>Watchtower, July 2008</ref>  Jehovah Witnesses disparage the Trinity by depicting it as a three-headed creature and claim the doctrine as a corrupt addition by [[Satan]] to Christianity. See [[Great Apostasy]].

In the 20th century [[Jehovah's Witnesses]] do not believe in the Trinity, and see it as contradicting the commandment to have no god but the one God.<ref>Watchtower, July 2008</ref>  Jehovah Witnesses disparage the Trinity by depicting it as a three-headed creature and claim the doctrine as a corrupt addition by [[Satan]] to Christianity. See [[Great Apostasy]].