I remember when I was a teenager (maybe 17 or 18?), during my COGIC years, there was this woman, "Sis. L."
She was part of a large 3rd or 4th generation COGIC family. Her grandmother was one of the founding members of our church, her parents had both been lifetime members of the church, and she and her 3 sisters were raised there, and she was raising her own 2 daughters there as well. Her sisters, their husbands, and their children were all active members of the church... choir members, ushers, missionaries, SS teachers, etc. Grandmother was on the Mothers' Board. Sis. L had two spiritual gifts that I remember: prophecy and interpretation. She was very quiet, very sweet; always smiling, never talking. Radiant. Her own husband was unsaved, but she and her children never missed a service, prayer meeting, Bible Study, nothing... she was very active.
One day, she didn't come to church. I asked her sister where she was and told her to tell her I had missed her that Sunday. Her sister said, "pray for her." Later that week, I found out that she had joined the Kingdom Hall and became a JW and never looked back. When her grandmother passed away, she and the children didn't even come to the homegoing service because of the JW "rule" that they don't step foot into churches.
To this very day, I am stumped. I just don't get it. Period.