Check this
https://en.wikipedia.org/wiki/List_of_countries_by_external_debtUnited states is number one, China is number ten, Russia is number twenty nine, and Germany is number eight. It means you're wrong if you think strong economy countries aren't in debt.
Debt isn't always bad for filthy rich people or countries, watch Robert Kiyosaki how he use debt to make more money and protect his wealth.
Not only that but also in the part he said countries with strong economy control the world political and religion system. That very statement is arguable because I don't see the relationship between the religion and economic. Although, a strong economy is seen as an indicator of a country's power and influence in the international arena.
It's already known fact that some countries have more influence and recognition than others in the global system and economic actually play a vital role but in the aspect of religion and politics, they only have the power to regulate religious practices within their own territories and not extend to external regions. I would have agreed if Op only mention politics because some of this super power countries have an indirect influence in politics of their dependent countries but that of religion is strange to me.