Other than the Roman Catholic Church, the largest member-based organization in the world is:

Name: Other than the Roman Catholic Church, the largest member-based organization in the world is:
Brand: Quizplus
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Question

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AARP, formerly known as the American Association of Retired Persons, is a nonprofit organization that focuses on enhancing the quality of life for Americans aged 50 and above. With over 38 million members, it is the largest member-based organization globally, other than the Roman Catholic Church.

Other Than the Roman Catholic Church, the Largest Member-Based Organization