
1) Joseph Smith espoused it 2) Protestantism
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https://www.crosswordclues.com/clue/mormonism

Mormonism is the predominant religious tradition of the Latter Day Saint movement of Restorationist Christianity. This movement was founded by Joseph Smith, Jr., in the 1820s. During the 1830s and 1840s, Mormonism gradually distinguished itself from traditional Protestantism. Mormonism today represents the new, non-Protestant faith taught by Smith...
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http://en.wikipedia.org/wiki/Mormonism

• (n.) The doctrine, system, and practices of the Mormons.
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http://thinkexist.com/dictionary/meaning/mormonism/

Unusual among contemporary forms of Christianity in that it expounds a pluralist viewpoint. According to its founder, Joseph Smith, a multiplicity of inhabited worlds is part of God's plan of salvation. This truth supposedly came to Smith in a series of revelations and is said to be evinced by vario...
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http://www.daviddarling.info/encyclopedia/M/Mormonism.html
Mor'mon·ism noun The doctrine, system, and practices of the Mormons.
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http://www.encyclo.co.uk/webster/M/102

[
n] - the doctrines and practices of the Mormon Church based on the Book of Mormon
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http://www.webdictionary.co.uk/definition.php?query=Mormonism
noun the doctrines and practices of the Mormon Church based on the Book of Mormon
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https://www.encyclo.co.uk/local/20974
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