Not that I am advocating one church over another. Rather, I'm just trying to make the point that other religions (such as the two cited below) have an organized preaching work.
Jehovah's Witnesses use the reasonings of, "Who else carries out the commission to preach?" When you try to show them that others indeed do follow the commission to preach, they will then reason that they are not teaching Bible truths. Of course the definition of 'Bible truths' is open to interpretation. If someone believes what the Witnesses teach, then that someone would believe that the Witnesses teach Bible truths. The same can be said for Mormon's, Adventists, and so forth.
Of course, how would any religious organization grow if it didn't preach in one capacity or another?
The Church of Jesus Christ of Latter-day Saints
Key Facts and Figures
Membership data December 31, 2000:
Worldwide: 11,068,861
U.S. (approximate): 5,208,827
Non-U.S. (approximate): 5,860,034
Female 53 percent
Male 47 percent
Number of Church units worldwide (congregations): 25,915
Languages in which the basic Church curriculum text is available: 175
The Book of Mormon: Another Testament of Jesus Christ
Copies published since 1830: 105,000,000
Copies distributed in 2000: 5,700,000
Languages in print: 100
Seventh-Day Adventist
SABBATH SCHOOL AND PERSONAL MINISTRIES
Year: 2000
Bible School Enrollments: 1,092,963
Bible School Graduates: 481,160
Lay Crusades and Seminars: 202,263
Lay Bible Studies: 9,308,661
Baptisms*: 1,092,890
Pieces of Literature Distributed: 74,023,800
Community Services Units: 135,787
Ingathering Funds: 9,622,709
Sabbath Schools: 120,261
Sabbath School Membership: 14,548,496
Percent of Church Membership: 124.48%
2000 . . . . . . . . .
Total Ingathering Funds 1908-2000 US: $608,643,478
*Persons baptized as a direct result of outreach by lay members.