The best remedy for this is common sense reason.
So what I suggest is to reunite Reason and Faith, Natural Law with Torah Law, This was certainly the approach of the Rambam. At any rate you can see why Lithuanian yeshivas are so strict to keep out cults and cult members. They would not have to be so careful if Torah was a secular discipline. It is because Torah is holy that the flies are attracted as to honey.
Every value has an opposite value. And when the positive value loses its purity it decays into it opposite. So when people use the Torah for personal motives, it causes the holiness of the Torah to leave it and in its place is unholiness.
I have heard that Germany is especially concerned with the problem of cults, but I doubt if they made much progress in understanding or dealing with the problem. And I myself only became aware of my own weakness in this area recently. It is a hard problem. I have suggested before the idea of Rishonim. That is if you are Jewish then the best place to learn about it is books from the Middle Ages before cults became a problem and the emphasis was to combine reason with revelation. I suggest that this applies to Christians also. That is to go back to the Middle Ages and read the source material from that time --like Aquinas etc would be the best approach. I got this idea in my first yeshiva and I think it is the cure for cults. [That is go back to medieaval sources.]