Recent conversation with my wife went like this (she still wants to believe in the Bible, God, etc. while I don't think it's really necessary):
Her: I'm glad we're out of JW.
Me: Me, too. Our family is happier than ever with LOW STRESS.
Her: I feel sorry for them. They're a part of false religion that God is going to destroy.
Me: They're not the truth but why do you think God is going to destroy them?
Her: Because the Bible says God is going to destroy all false religion.
Me: No it doesn't.
Her: Yes, Babylon the Great is going to be destroyed!
Me: How do you know Babylon the Great means false religion?
Her: It's in the Bible.
Me: No it isn't. It only says that the beast that the harlot named Babylon the Great is riding throws her off and destroys her. It doesn't identify either the beast or the harlot.
Her: You're right. It doesn't. (light bulb dawning moment that her entire concept on this issue is Watchtower based)
We've all got a lot of these and we usually don't even realize it.