The US constitution and First Amendment were created by Liberals who value free thought, both religious and non-religious. Atheism does not automatically have a negative effect on society, but does create opportunists to change things in ways that were not possible with widespread religious people.
I am open to viewing one example of how atheism has contributed to the development of Western Civilization over the past 1000 years. "widespread religious people" does not hamper progress,
it was the Catholic Church that invented the university, encouraging free thought. "Free thinkers" did not invent free thinking.
It depends on how you view the relationship between morality, freedom, atheism and religion.
"...Usually, the opponent of Christianity is quite willing to critique what they feel to be our glaring deficiencies, but quite unwilling (for some strange reason) to examine what we regard as the shortcomings in theirs. People in all worldviews seem to be much better at levying charges and poking holes, than at scrutinizing their own beliefs, wouldn't you agree?
The atheist:
1) Can't really consistently define "evil" in the first place;
2) Has no hope of eventual eschatological justice;
3) Has no objective basis of condemning evil;
4) Has no belief in a heaven of everlasting bliss;
5) Has to believe in an ultimately absolutely hopeless and meaningless universe...
What I was implying was that according to the atheist's presuppositions, taken to their ultimate logical (and above all, practical, in concrete, real-world, human terms) consequences, cannot be carried through in a non-arbitrary manner, and will always end up incoherent and morally objectionable. All attempts that I have seen (admittedly I may very well have missed many) have not adequately explained how to overcome this inherent moral relativism, whereby some man (often, in real life, a dictator) "determines" what is right and wrong, imposes it on a populace, group, or family, and people try to live by it happily ever after.
Simply put..., atheist justifications for morality (i.e., logically carried through) will always be either completely arbitrary, relativistic to the point of absurdity, or derived from axiomatic assumptions requiring no less faith than Christian ethics require. I think it was Dostoevsky who said "if God doesn't exist, anything is permissible." Sartre said something similar, which I don't recall at the moment (probably someone here would know to what I am referring)....
...And I would contend that it could also (by logical extension) be that in the mind of an immoral atheist who felt himself to be the "measure of all things," as the humanists say. I'm very interested in what the decent, moral atheist would say to these folks; how it would be
explained to them that atheism is incompatible with such reprehensible behavior (and why and how the other person should be "bound" to the moral observations).
And why is that? We say it is because God provides the over-arching "absolute" and principle of right and wrong which allows for coherent ethics and non-arbitrary determination of good and evil. We even believe that God
IS love. Love and goodness is personified and expressed and grounded in His very Being. Furthermore, Christians believe that God put this inherent sense in all human beings, so that they instinctively have a moral compass, and therefore largely agree on right and wrong in the main (murder is wrong, so is betrayal, rape, stealing, etc., in all cultures - it may be defined in particulars somewhat differently, but the consensus is there).
Atheists have this sense, put there by God, just as believers do, whether they acknowledge it or not (though it can, of course, be unlearned by intellectual conditioning or surroundings). And their behavior proves it. That's why (in our opinion) they are usually as moral and upright as a group as any other group of people. But to the extent that they are moral and good, I argue that this is inevitably in conflict with their ultimate ground of ethics, however it is spelled-out, insofar as it excludes God. Without God it will always be relative and arbitrary and usually unable to be enforced except by brute force. Atheists act far better than their ethics (in their ultimate reduction).
Biblical Evidence for Catholicism: Dialogue With an Atheist on the "Problem of Good" and the Nature of Meaningfulness in Atheism (vs. Mike Hardie)