My thoughts on Believers SPOILERS
SPOILERS
Even if the cult was right about the end of the world, I don't think they were necessarily right about everything. They may have started out as some sort of scientific research group, but they have deteriorated into a cult of mindless followers and a leader who thinks he's God (which does happen in science, but that's when science goes bad.) They claim they have a formula which explains the entire universe, and if you understand it, you will have irrefutable proof of its truth. Now, maybe you have to be an advanced mathmetician in order to truly understand it (or discredit it, "Whoops, you forgot to carry the 2"), but they don't even try to "scientifically" explain it to the paramedics. Instead, they use tactics that are more like brainwashing, than any attempt to get the paramedics understand their position rationally. They kidnap the paramedics at gunpoint, strip them of their clothes (i.e. things that help them keep in touch with their individual identity), and hose them down with cold water. They then lock them into tiny individual rooms (former toilet stalls), and instead of treating the injured Victor so he can clearly understand what is going on, they let him continue to bleed. There's no food, a choice between using your toilet for water or the disposal of waste products (and it's never made clear if they can flush), and no way to rest or sleep comfortably. The Teacher tries to wow them with "magic" tricks like knowing personal information and Rebecca's resurrection, but he doesn't try to explain the "science" behind them, and seems to be using them more with the idea of stunning them into unquestioning belief. And Rebecca's "resurrection" is something of a cheat. She seems brain-damaged and the Teacher is apparently controlling her like a puppet at times. She's clearly still unsure about the truth of the cult's teaching, but while she skips the suicide room, she allows her daughter to go in, which I don't think she would do if she was fully functional. (There's also the question of Rebecca's condition at the start of the film; she is in such poor shape that running to a nearby gas station, a trek that her daughter makes without seeming too worn out, causes her to faint and go into cardiac arrest. What were they doing to her up there?) After they finally treat Victor's injury, he seems to be either feverish, doozy from blood loss, drugged or maybe recovering from electro-shock treaments like Dave receives later in the film. It is when Victor is clearly unable to think very well, that Rebecca is sent in to convince him of the "truth" of their mission. She does so by pointing out some apparent similarities between his Catholic Faith and theirs, and then tells him to completely abandon Catholicism and embrace their "formula" instead. Oh, and she has sex with him, a rather unorthodox method of proving statements "scientifically." It's made clear that anyone who disagrees with what the Teacher says is not invited to make his arguments and then have them refuted rationally or through presentation of proof. Instead, objectors are locked up into little cells to "reflect," or they have their "impurities" driven out by electro-shock, which can cause disorientation and memory loss. For a group so big on how they have irrefutable proof of what they say, they certainly seem to avoid showing this proof, or rationally investigating and weighing the proof, as much as possible. And even if they were right about being able to travel to another planet, I don't think they are people I'd want to be stuck with.