This article is biased and tries hard to make a point that the US is rich because the majority religion is protestant, while it's rather that the US is rich despite being a very religious country. The article even says that the richer a country, the less religious it is, except for the US, which means the claim about protestant religion and wealth is baseless.
Also even within the US, the more educated, less religious people tend to be, and that means in poorer neighborhoods there's more religious people, and there's a higher percentage of people in jail who are religious compared to the percentage of religious people in the general population.
What is the definition of a Protestant state? From the article, there is no definition. There is only a reference to what is written on a U.S. dollar bill.
I only know of one country where a Protestant religion (Anglican) is the official church of state: the UK.
The U.S. has no official church of state. The U.S. constitution guarantees a separation of church and state, and this right is carefully protected.
According to Pew Research, there are 30 countries where the head of state is required by law to be of a certain religion [1]. Only two of these are Christian: Andorra and Lebanon.
There are additionally 19 countries where a ceremonial monarch is required to be a certain religion, including the UK. [1]
Nonsense, east European countries are still Christians and very poor, then you have the gulf countries that are Muslims and very rich, there basically is no correlation between religion and wealth on nation level.
Also even within the US, the more educated, less religious people tend to be, and that means in poorer neighborhoods there's more religious people, and there's a higher percentage of people in jail who are religious compared to the percentage of religious people in the general population.