Humans greatest lie is not God.
Humans greatest lie is love. There isn’t much of it among strangers and humans grossly over estimate it.
Faith in religion is but a minor stupidity compared to an even greater stupidity that cause it. A greater stupidity is faith in humanity itself.
Humans, believing humanity, have a hard time understanding that so many people would believe a false thing, hence thinking that what the crowds believe must be true.
The truth is humans will much more eagerly embrace falsehood that benefit them compared to truth that hurt them. That’s how we got religions. Religion is just one of the symptom.