Well, I don't know that I'd call it a cult-like practice, but my ex-stepmother, who claims to be a born again Pentecostal, called my grandmother after my aunt died simply to tell my grandmother that my aunt was going to hell because she was in the "wrong religion". It was an incredibly unloving, unChristian thing to do, and Grandma is still hurting from it over a year later. Perhaps my ex stepmother's religious ideas influenced what she did, but I think it stemmed more from the fact that she couldn't cause a division between my grandparents and my father (their son) after he divorced the woman.
At any rate, it reminded me a WHOLE LOT of all the Watchtower studies on the fate of unbelieving mates and family members at Armageddon. What I can't figure out is why people who claim to be Christians can make such "authoritative" claims, in light of the scriptures that say not to judge others.