If people do not fear God, then the culture will disintegrate.
The culture *has* disintegrated. All of this happened in America a long time ago. Cultural momentum created the illusion that America was still predominantly Christian. I think we are about 15% of the population, to be realistic, and 30%, to be very optimistic.
FWIW, these figures seem to reflect regional changes in the Northeast most of all. The so-called Bible belt is not, IMO, becoming noticeably less Christian.