According to a Pew Survey, "By several measures, young adults tend to be less religious than their elders; the opposite is rarely true".
In 41 of 106 countries, adults ages 18-39 are much less likely than those ages over 40 to say religion is very important to them.
Of the remaining 65 countries, 63 countries show little significant difference and only two countries show religion more important to under forties than those older than them.
According to Pew: "Although the age gap in religious commitment is larger in some nations than in others, it occurs in many different economic and social contexts – in developing countries as well as advanced industrial economies, in Muslim-majority nations as well as predominantly Christian states, and in societies that are, overall, highly religious as well as those that are comparatively secular.
"For example, adults younger than 40 are less likely than older adults to say religion is “very important” in their lives not only in wealthy and relatively secular countries such as Canada, Japan and Switzerland, but also in countries that are less affluent and more religious, such as Iran, Poland and Nigeria".
Religion has survived down the centuries by parents indoctrinating their children with their own beliefs. In modern society, young adults are increasingly questioning what they are taught - and rejecting religion as false.