Evangelicals on the content of spirit revelations.

I was reading this one anti-cult book from the 70s by an evangelical, and it quoted another anti-cult book from the 70s by an evangelical, and it said that the content of spirit revelations to people are infallibly about the afterlife and lead away from biblical notions of sin, final judgment, heaven, and hell -- that is, the book implied that spirit revelations are by evil spirits, and they try to trap us into thinking that heaven and hell are nothing like what Christians usually think, and so they make us complacent in our sins and thereby trap us into hell.