This topic brought back a few memories:
One "recruitment tactic" once (possibly still) used by Seventh Day Adventists was related to a set of books for children published by them "The Bible Story" which related the Bible from Creation to Armageddon in story form. They were lavisly illustrated in color with many pictures similar to the Bilble and Paradise illustrations in Watchtower publications.
A sample volume was often placed in Doctor's Office Waiting Rooms, with postcards that people could send for more information. When I was about 7 years old my mother must have done this, as I came home from school to find her talking with a man who was apparently selling her the set. They must have sent out a local representative. I very dimly recall being briefly invited to join the conversation, and seeing a picture of a child in an armchair reading one of the books, with Jesus standing behind the chair looking on.
At that time I was attending a Methodist Sunday School, but when I came home would read in the books. It was mainly from these that I first got knowlege of the Bible. I learned the name 'Jehovah' from these as it was extensively used in the chapters about the prophet Elijah, because of the showdown between Jehovah and Baal.
They also offered a study the Bible by mail correspondence course which my mother took. Lessons were sent out, you were to look up the cited Scriptures and write answers to questions on the blanks provided. They were then mailed back, then sent back to you graded and with comments. My mother completed this but I don't recall her ever saying anything specific about it.. There was also a children's version that she signed me up for, but after a few lessons I got tired of it and stopped sending them back. I got a couple of (form) letters urging me to resume, asking what had happened and suggesting "...sometimes children are embarrased because they have misplaced the lessons.." In my case I was ignoring them and they stopped sending them.
My mom never committed to any one church, but always has been interested in learning about various religions.She never wanted an in-person study with Witnesses though. Much later she took a long correspondence course with a New Age group called Astara.
I must have taken after her because even as a Witness I've never stopped checking out other religious publications and broadcasts.