An objective person living in a country that is primarily of one religion would say, we are all devote followers, does our God bless us?
Could a muslim would look around his shthole country, and say this? Nope. That in of itself should tell them they are worshiping a false God.
The wealthiest classes in America are the least religious; the most religious classes are the poorest.
Christianity is growing fastest in Africa, the poorest continent; it has waned almost to nothing in wealthy Northern Europe.
The 21 Christian Martyrs of Libya who were beheaded in 2015 explicitly because they would not renounce Jesus, were there as migrant workers. They are among the poorest people in Libya.
On the other hand, the Islamic Salafist Saudis are rich, rich, rich.