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Secular Definition of Religion
While Mormons may disagree with doctrine of other churches, they do not believe in contending—that is, arguing—about religion, because they believe the source of all contention is the devil. They are always willing to reason and discuss, but they are counseled by Church leaders to never descend to heated, antagonistic debate. Gentle persuasion is the answer to the convincing of others, but never hard words and harsh treatment. Mormons believe that is not Christ's way.
Mormon Definition of Religion
As Levi Edgar Young said, “No religion made by man can do for men that which must be done” (Conference Reports Oct.1848, p. 94), so Mormons don't believe that other churches, however well-intentioned, contain the power needed for salvation. “There is no salvation in a false religion” (Mormon Doctrine, p. 627). Understanding that this belief may offend members of other churches, Mormons nevertheless don't apologize for the claim that the Church of Jesus Christ of Latter-day Saints is the only true church on the earth. A big statement, but one that was given to them from God, rather than one assumed by leaders or members. Those investigating the Church who hear this claim sometimes mock and are amused, but millions of them have discovered that it is true and have asked to be baptized.
Nevertheless having true religion means more than just joining the Church. True followers of religion actively participate and progress. Under the Mormon definition of religion, religion is more than simply theology, “more than a knowledge of Deity and the system of salvation revealed by him; it is the actual practice of the revealed precepts. Religious people are 'doers of the word, and not hearers only' (Jas.1:22-26)” (MD, p. 626). So Church members who are lukewarm, passive, apathetic, and semi-active don't fit the definition of religious people, ones who will qualify for celestial glory, but those who, to the best of their ability, follow Christ as He leads and guides the Church will reap the reward.