Indeed, there is also the fact that in emerging global powers outside the West like China, Christianity is increasingly becoming the religion of choice for the sophisticated, urban middle classes.
In other words, as Chinese people increase their wealth and standard of living, their likelihood of being Christian also increases (i.e. because Christians tend to be middle-class).
This same trend is occurring all across South-East Asia:
Evangelicalism is spreading among the Chinese of South-East Asia
Evangelicalism is spreading among the Chinese of South-East Asia
Devotees are “too blessed to be stressed”
Jan 4th 2018|
Evangelical and Pentecostal Christianity is growing more quickly in Asia than most parts of the world, with over 200m adherents in 2015, up from 17m in 1970. The largest congregations are in South Korea and the Philippines, where dazzlingly large mega-churches hold tens of thousands of people. But Christian zeal is also increasing in other parts of the continent, including Indonesia and Malaysia, where proselytising among the Muslim majority is well nigh impossible, but where Buddhists, Confucians and Christians of other denominations, almost all of them ethnically Chinese, are proving receptive...
Most evangelicals see the growth of their churches as God’s work. But it also seems to have an aspirational element to it. “It is the de facto middle-class religion right now,” says Mr Chong. According to a study he conducted in 2013, over 50% of mega-church-goers had a university degree, a higher proportion than Christians of other sorts. That was in spite of the fact that mega-church Christians were more likely to have lived in public housing and to come from working-class backgrounds. They were also more likely to speak Chinese and to come from families which were not previously Christian.
Friendly ushers and peppy slogans (“too blessed to be stressed”) make the churches appealingly accessible. They are also good spots for making business connections. Churches in Singapore are places where people network with those they trust, says Thomas Harvey of the Oxford Centre of Mission Studies, a British charity. The feeling is that “these are people we know, these are people of integrity, character, education,” he says.
But these facts are not yet recognised by a lot Western and especially Eurocentric academics, who are obsessed with the empirically untested notion that Western norms of secularization working-in-tandem with higher living standards is some universally applicable 'social rule' across cultures.
It isn't, rather it betrays the bias of an ever increasingly more marginal part of the world (the West is declining in influence with every passing decade, while China and India rise). We are no longer the torchbearers and trend-setters for the rest of the planet.
By 2050, China will have more Christians than any other country in the world and Hindu India will have become a true powerhouse, with some even suggesting it may become a developed country.
And I see little evidence to suggest that Islamic religiosity in majority Muslim countries will be significantly dented by any projected rise in living standards or economic productivity, as you indicate with reference to Dubai and the Arab Emirates.
The decline in Christian attendance and affiliation in the West should, I think, be attributed to factors inherent to Christian churches and their failures, than it is to religion as a whole or supernatural beliefs (the latter of which remain stubbornly persistent as we can see from horoscopes and belief in superstitious luck).