That is why children are no longer seen as a gift from God, but a burden, why babies can be killed in the womb , much as you might do with an unwanted litter,in some places handicapped infants allowed to starve to death,. children think nothing of inflicting violence on each other , society wants to reduce the non productive member so they have more money...
When God is removed from creation..of what special value is any creation ? A man=a dog= a spider = a tomato plant...just life nothing noteworthy here, just keep moving along.. while they starve the helpless and soon the elderly, men can avert their eyes
Starting with the Age of Reason (I'm sure it happened earlier, but it has been going on continuously since the Age of Reason) some have tried to replace God with intellect.
This has lead to a form of nihilism where life has no inherent value, only "ideas" and "theories" matter.
For a couple centuries this seemed okay, but then the French Revolution occurred and millions died BECAUSE of intellectual thoughts (some will try to say that this happened earlier with the Reformation and Counter Reformation, but those deaths, while horrible, were about beliefs in God, NOT denial of God).
These deaths continued by the millions in the communist revolutions in Russia, World War II and the expansion of communism.
Then in the mid-20th century the intellectual atheists succeeded in convincing many people that war was inherently wrong, but that killing people was still acceptable, hence abortion, euthanasia and the "green movement".
The worldwide abortion death toll in the past century is more than ONE BILLION HUMAN BEINGS, this exceeds the number of lives lost in all of the wars, famines, plagues and natural disasters in the history of the world COMBINED. And now that abortion seems to be "accepted" around the world, the atheists are pushing euthanasia and the "green movement" where the living only have value if they are producing.