I think atheists will make the world a dull and dreary place.
Nobody will be able to celebrate anything without upsetting them and having their dull signs and tedious lawsuits to inject misery in every happy occasion. :bawl:
Soon you'll have their miserable pronouncements overshadowing every festival, Christmas will become a commercial enterprise lacking any cheer, nativity scenes will disappear, churches will be abandoned and replaced with sterile ugly [but practical] buildings. It will become impossible to have a Santa in the store and choirs and carollers will be banned. No more Christmas lights, Easter baskets no more public adhans or Diwali crackers in public.
Everyone will be dull and practical and live like drones.
Everyone will be rationalised to death.