How can religion be dangerous?
In so many ways. Religion and blind faith are detrimental to our development as a species. Here is only an example of how religion harms us.
John Hagee is a dangerous man and people should pay more attention to what he is telling his followers. Saying that stay at home dads will go to hell implies that women are forever destined to a secondary role in society. Having approximately half the world's population intentionally held back hinders our progress and can only lead to another period of the dark ages.