In the face of the growing volume and assertiveness of different religious bodies asking for preferential treatment, secular opinion has hardened. The non-religious response has come largely from individuals who have a platform or the talent to speak; and they speak for themselves, not for an organisation.
In the US, the religious Right numbers about 35 million. Recent polls show that about 30 million Americans define themselves as having no religious commitment.
But whereas the religious Right is a formidable body whose constituent churches and movements have salaried administrators, vast funds, television and radio outlets, and paid Washington lobbyists, America's non-religious folk are simply unconnected individuals.
It is no surprise that the religious Right has political clout and can make a loud noise in the American public square, whereas the non-religious voice is muted.
There are two main reasons for the hardening of responses by non-religious folk.
One is that any increase in the influence of religious bodies in society threatens the de facto secular arrangement that allows all views and none to coexist. History has shown that in societies where one religious outlook becomes dominant, an uneasy situation ensues for other outlooks; at the extreme, religious control of society can degenerate into Taliban-like rule.
Look at the period in which liberty of conscience was at last secured in Christian Europe - the 16th and 17th centuries. It was an exceptionally bloody epoch: millions died as a result of a single church's reluctance to give up its control over what people can be allowed to think and believe.
The famous Treaty of Westphalia in 1648 accepted religious differences as the only way of preventing religion from being an endless source of war. Religious peace did not come straight away, but eventually it arrived, and most of Europe for most of the years since 1700 has been free of religiously motivated strife.
But this is under threat in the new climate of religious assertiveness.
Faith organisations are currently making common cause to achieve their mutual ends, but, once they have achieved them, what is to stop them remembering that their faiths are mutually exclusive and indeed mutually blaspheming, and that the history of their relationship is one of bloodshed?
The second reason why secular attitudes are hardening relates to the reflective non-religious person's attitude to religion itself.
Religious belief of all kinds shares the same intellectual respectability, evidential base, and rationality as belief in the existence of fairies.
This remark outrages the sensibilities of those who have deep religious convictions and attachments, and they regard it as insulting. But the truth is that everyone takes this attitude about all but one (or a very few) of the gods that have ever been claimed to exist.
No reasonably orthodox Christian believes in Aphrodite or the rest of the Olympian deities, or in Ganesh the Elephant God or the rest of the Hindu pantheon, or in the Japanese emperor, and so endlessly on - and officially (as a matter of Christian orthodoxy) he or she must say that anyone who sincerely believes in such deities is deluded and blasphemously in pursuit of "false gods".
The atheist adds just one more deity to the list of those not believed in; namely, the one remaining on the Christian's or Jew's or Muslim's list.
Religious belief is humankind's earliest science. Judaism, Christianity and Islam are young religions in historical terms, and came into existence after kings and emperors had more magnificently taken the place of tribal chiefs. The new religions therefore modelled their respective deities on kings with absolute powers.
But for tens of thousands of years beforehand people were fundamentally animistic, explaining the natural world by imputing agency to things - spirits or gods in the wind, in the thunder, in the rivers and sea.
As knowledge replaced these naiveties, so deities became more invisible, receding to mountain tops and then to the sky or the earth's depths. One can easily see how it was in the interests of priesthoods, most of which were hereditary, to keep these myths alive.
With such a view of religion - as ancient superstition, as a primitive form of explanation of the world sophisticated into mythology - it is hard for non-religious folk to take it seriously, and equally hard for them to accept the claim of religious folk to a disproportionate say in running society.
Against All Gods by AC Grayling