Are other large church organizations like Catholics and the Mormons incorporated? And, How do they protect their stuff?
Good question! There is no attempt, for example, to trademark the name "Baptist." There are thousands of organizations using said name. Here is a list for the U.S.A. only:United States Alliance of Baptists
American Baptist Association
American Baptist Churches
Association of Reformed Baptist Churches of America
Association of Welcoming and Affirming Baptists
Baptist Bible Fellowship International
Baptist General Conference
Baptist Missionary Association of America
Central Baptist Association
Christian Unity Baptist Association
Conservative Baptist Association of America
Continental Baptist Churches
Cooperative Baptist Fellowship
Enterprise Association of Regular Baptists
Evangelical Free Baptist Church
Free Will Baptist
Full Gospel Baptist Church Fellowship
Fundamental Baptist Fellowship Association
Fundamental Baptist Fellowship of America
General Association of Baptists
General Association of General Baptists
General Association of Regular Baptist Churches
General Conference of the Evangelical Baptist Church, Inc.
General Six-Principle Baptists
Independent Baptist Church of America
Independent Baptist Fellowship International
Independent Baptist Fellowship of North America
Institutional Missionary Baptist Conference of America
Interstate & Foreign Landmark Missionary Baptist Association
Landmark Baptists
Liberty Baptist Fellowship
Macedonia Baptist World Missions
Mainstream Baptist Network
National Association of Free Will Baptists
National Baptist Convention of America, Inc.
National Baptist Convention, USA, Inc.
National Baptist Evangelical Life and Soul Saving Assembly of the U.S.A.
National Missionary Baptist Convention of America
National Primitive Baptist Convention of the U.S.A.
North American Baptist Conference
Old Regular Baptist
Indian Bottom Association of Old Regular Baptists
Old Time Missionary Baptist
Original Free Will Baptist Convention
Primitive Baptists
Progressive National Baptist Convention
Reformed Baptist
Regular Baptist
Roger Williams Fellowship
Separate Baptist
Separate Baptists in Christ
Seventh Day Baptist General Conference
Southern Baptist Convention
Southwide Baptist Fellowship
Sovereign Grace Baptists
Two-Seed-in-the-Spirit Predestinarian Baptists
United American Free Will Baptist Church
United American Free Will Baptist Conference
United Baptists
Unregistered Baptist Fellowship
World Baptist Fellowship
Worldwide Baptist New Testament Missions
United States - Regional bodies Association of Fundamental Baptist Churches of Northern California
Association of Independent Baptist Churches of Illinois
Baptist General Association of Virginia
Baptist General Convention of Oklahoma
Baptist General Convention of Texas
Dakota Baptist Association
District of Columbia Baptist Convention
Empire State Fellowship of Regular Baptist Churches
General Baptist State Convention of North Carolina, Inc.
Inter-Mountain Baptist Fellowship
Minnesota Baptist Association
Minnesota Baptist Conference
Mountain States Baptist Fellowship
New England Evangelical Baptist Fellowship
Ohio Valley Association of Christian Baptist Churches of God
Southern Baptists of Texas Convention
Wisconsin Fellowship of Baptist Churches
If Adventists were to follow the example set by Baptists, the number of Adventists in the world might increase significantly.Think about this: Almost 100 Baptist denominations in the U.S. only!