I have a reverse example in my father. He was raised evangelical Christian, but had not been to church in about 20 years. My sister started studying with JW's and attending meetings. She blackmailed my mom into going to a meeting, by telling her my niece could only spend the night if Grandma would come to the meeting tomorrow. (!!) My mom went along with it. Within weeks, my dad was curious and started attending the meetings and studying with my mom.
My father is a salesman by trade, and absolutely loves talking to people and selling them new phone systems. He had found a higher purpose for his sales skills! He loves field service, and glows when he tells us stories about things he has had happen out in service, or anecdotes about his friends "at the hall..."
My dad and my brother in law got into a sort of pissing contest, to see who could be a better JW, put in more hours, get more privileges and duties. He has totally committed to the org now, telling the family publicly that his top priority is to be a "good JW." He emailed me privately, telling me that even if I did ever decide to join the JW's, he would always still prefer my sister and his family. "It's only natural... You understand." He makes statements now about how, "They are smarter than me!" and when I asked him what is the difference between me and you? Am I going to die at Armageddon because I decided not to become a JW? His response: "That's not for me to decide. That's what I love about this! I don't have to judge people anymore." Egads.
My salesman father LOVES pushing doorbells, talking to strangers, and yes, even pushiing literature on uninterested family members.