Whenever religion is used to suggest that there is a certainty: about the nature of God, if any; the nature of humanity, as if knowable; morality, if unconnected to pertinent circumstances, then religion is dangerous because of instead of generating genuine reflection and a healthy quest for more information and spiritual growth, it postulates that everything is already known and not worthy of our intellect, our compassion, or our investigation.
The world’s great religions are aligned with the journey of discovery, the mystery of spiritual enlightenment, and the challenge of learning ethical conduct for all human beings.
It is not religions that fail, it’s religious people who seize upon an imperfect understanding of faith, and seek to impose it on themselves and all others.
This is as true of fundamentalist atheists as it is of Jihadists of all other descriptions. To assume that one person actually knows the true nature of the universe, including the total certainty that there can be no God or universal consciousness of any kind is as religious as an absolute faith in any other religion and is just as dangerous as fanatically believing in any other cant.