The question, "AND what group are YOU a part of?" shows the mind control nature of the WTS.
To them, you're either in God's organization or Satan's organization.
The possibility that you're not in any organization doesn't compute with them.
Check out Mark 9:38-41. Jesus' disciples were upset because some people who weren't a member of their group (organization?) were casting out demons in Jesus' name. They told them to stop.
In contrast, their independence from the group didn't bother Jesus at all.
Jesus didn't go to those people and inform them of the importance of joining "God's organization," going door to door with him, or even attending an upcoming meeting.
Very "untheocratic" of him, wouldn't you say?