What if . . .
a highly advanced alien civilization wanted to conquer earth by enslaving as many as possible? What if this highly advanced alien civilization got their hands on the bible and/or other religious texts and saw that there are prophecies of an end to come?
Could it seem very practical for the alien invaders to devise a plan to masquerade as the coming christ to trick all deluded christians to side with them and serve them, and at the same time demoralize earth's military into thinking there is no way to fight back since no one can fight against God?
If a large percentage of your enemy believes in an almighty God and if the remainder is only familiar with the concept; then given the knowledge of your enemy's God and given that you have the technological means at your disposal you can easily convince the majority that you are God and utterly demoralize them from putting up any fight at all. That enemy would be like "primitive" superstitious people living in the jungle who are so awe-struck by "advanced" modern explorers that they mistake them for Gods and quickly surrender without putting up a fight.
On the other hand, if your enemy is not religous then it would be difficult to convince them that you are God. They will see you as mortal, as theoretically defeatable - even if you are technologically advanced and the odds are against them. They will still give their all in the hopes of somehow succeeding because they do not see you as absolutely invincible - as God.
Could religion - specifically the apocalyptic religions - make us vulnerable to criplingly demoralizing psychological warfare by an advanced alien race? Could religion thus turn out to be the undoing of earth's "intelligent" inhabitants? I think this illustrates a great danger that religion poses to humankind.