Not necessarily scared but cautious because it's dealing with people for whom logic does not apply. Just take a look at all the different interpretations of the Bible, for example. First, the individuals in question discard logic and commom sense and then replace it with what only they consider the truth. For example, a "calling" or "the voice of God" may well be a symptom of schizophrenia or bi-polar illness. While the majority of those folks are not dangerous some are very dangerous as in murderers, etc.
It doesn't take much imagination to picture the horrors that could be placed upon the world should such an individual hold a position of power. In fact, we see that today with the Muslin extremists but it's just as likely to happen with Christians and others. After all, the Bible contains numerous stories where God told one group of people to slaughter another group and make sex slaves of the women.
Mohammed may have an irresistible offer of 72 virgins but one has to die first. Christianity offered sex slaves while one was still alive. I'm more of a "show me the money" type of guy or in this case "show me the women". Then there's that old saying, "a bird in the hand is worth two in the bush". If it's a choice between sex slaves in the here-and-now or virgins in the there-after I'm going for the former.
Just saying.