If you want to know just how crazy fucked up Evangelical/Fundamentalist Christian views of the apocalypse are, and how that affects US politics, I recommend The Rapture Exposed by Barbara Rossing. She’s a (mainline) Christian theologian, so a lot of the book is about the theological and Biblical reasons why the Rapture is a horrible twisting of Christian beliefs. But she also spends a lot of time talking about just how fucked up the belief in the Rapture is, and the terrifying political and social consequences that set of beliefs has had for America.