Unitarianism is used when discussing theological beliefs about God's nature in Christianity. Her religious studies essay focused on Unitarianism and the concept of one God.
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Specific Denomination
Unitarianism refers to a particular Christian church; remember it's a proper noun. The Unitarian church is known for its Unitarianism stance on the Holy Trinity.
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Confusion Alert
Don't confuse Unitarianism with universalism, despite their historical merger in some regions. Though similar in some aspects, Unitarianism differs from universalism in its views on God.