We've sometimes argued here that a nation that spurns the Judeo-Christian God leaves itself no ground upon which to stand when making moral judgments. There may be the odd exception, of course, but a state whose moral pilings are not sunk into Divine law will sooner or later subside into dissolution and avarice and perhaps into violence and bloodthirstiness. Moreover, the more self-consciously secular or atheistic a nation becomes the deeper it will descend into this amoral mire. At least this has been the history of the twentieth century, but it's not just a phenomenon of the twentieth century.
Perhaps the paradigmatic example of the slide into degeneracy that results from a conscious rejection of a theistic foundation for morality is the terror that followed the French Revolution of 1789.
The revolutionaries were uncompromising atheists intent on fulfilling the hope attributed to the French philosopher Denis Diderot who was said to have exclaimed that he longed to see the day when the last king would be strangled with the entrails of the last priest.
Inspired by men like Diderot and Rousseau the French set about trying to establish a state in which the influence of the Church was expunged and priests were executed. The horror that followed the Revolution of 1789 is hard to imagine. Lacking any transcendent constraint upon their hatreds and passions the French authorities wallowed in an orgy of horrific bloodshed.
In the course of nine months some 16,000 men, women, children, and even infants were sent to the guillotine. Some 40,000 more died as a result of being whipped, branded, broken on the wheel, mutilated, or otherwise abused. On one day 800 people were hacked to death, and on another 500 children were taken to a meadow where they were systematically clubbed to death. River barges were laden with people and pushed out into the river where they were sunk, drowning all on board.
The 20th century witnessed similar horrors perpetrated by communists who, in the name of state atheism, murdered over 100 million people, and atheistic or pantheistic Nazis who in the name of socialism and racial purity murdered another 6 million. The fruit of a consistent secularism is a "might-makes-right" ethic, which leads to the dehumanization of the other, which, in turn, leads to the guillotine and the abattoir.
Those who despise theism and the Church and wish to be rid of them need to give serious thought to exactly what would likely take their place.
RLC