The restraint of mans passions, by God and by the examples from Bible to give order to mankind in his personal relationships has been successful; when not followed as a psychological, sociological, and legal guide societies fall into the abyss of unrestrained passions.
The failure of men to limit their own desires under the guise of personal freedoms soon becomes dictatorial as they demand all others give up their previous freedoms to make room for their own.
This is the tipping point, along with lawlessness and personal irresponsibility that destroy society(s).
Once they achieve more than a legal majority, and once they become a super majority devoid of empathy and full of desire, or passions unrestrained the entire group of people are at risk from new self inflicted woe.
“What I mean is that while there is still a relative balance between those who ascribe to God and those who deny or live as they want the society will continue to be as we see today - relatively safe in areas split but in areas already past the tipping point, dangerous for everyone.”
Spirited: Creeping moral decay serves the same purpose as heresy, that is, a thresher separating the chaff from the wheat until finally, the tipping point is reached when the unrighteous far outnumber the righteous.
At that time it will be as you said, the Godless will consume each other and the society they’ve created.