Less economically developed countries, or LECDs, typically have more fervently religious populations than more developed countries. Although developed economies do have high numbers of religiously affiliated citizens, numbers show that the more educated a nation is, the less ardent it's devotion to religion. LECDs are behind in terms of educational development and therefore more likely to be religious.
No, LEDCs do not have more religious people, because it is an economic group, not a religious group. There are probably just as many religious people in that group as opposed to any other, but it is not a group that is specifically for religious purposes. They have the same religious people as anyone else.