The author forgot to add,

according to evolutionary scientists

I'm not so sure that I agree with the reasoning also

affluence and wealth caused humans to have a "slower" lifestyle, suggesting the wealthy elite 2,500 years ago would have been less sexually active, less aggressive and overall lead more laid-back lives.

“Absolute affluence has predictable effects on human motivation and reward systems,” Dr Baumard et al wrote in a study, “moving individuals away from ‘fast life’ strategies (resource acquisition and coercive interactions) and toward ‘slow life’ strategies (self-control techniques and cooperative interactions.” Read more BBC religion head warns of 'chronic lack of religious literacy' in UK Atheism is as natural as religion, study suggests Liberalism and secularism are meant to let religion flourish Religion 'has been causing conflict for over 2,000 years'

The study says living a ‘slow life’ put the elite at an evolutionary disadvantage, as they may have had fewer children,In order to offset this disadvantage, Dr Baumard believes the wealthy introduced moralising religions to the poor as a way to introduce them to ‘slow-life’ strategies, therefore offsetting the evolutionary disadvantages the elite faced in being less motivated by acquisition, greed and procreation.

I am really not sure that this is true, given that some large fraction of the population of Ireland are related to one historical king, that there are other bottlenecks like this (Genghis Khan), that (apparently) since human civilisation began maybe 80% of men didn't reproduce and polygamy (or some form of multiple female partners for high status men) was somewhat common among the upper classes in just about every culture at some point.

I do think though that less religious attendance and less powerful more kind and spiritual type of religion seems somewhat correlated with the wealth of a country, but it is decently random and imo this is just masking levels of insecurity, the lowest levels of religion seem to be in countries with large and extensive welfare states that take 'random elements' out of life. The US has amongst the highest religious attendance in the developed world and it is the richest country.

What broke the back of the old, conservative Church in the UK was the national health service, which (though there was significant opposition) lots of Christian organisations campaigned for.