Your personal amusement notwithstanding..
Every worldview, of course, contains a system of morality including your own. Such a system proposes and supports principles--based on proposed sources of truth--pertaining to what constitutes moral truth.
So of course, the biblical worldview makes appeals to sources of truth concerning belief and practice. These include the Holy Spirit, God's word, reason, and history, not all of these being equal in terms of infallible authority.
Pertaining to history, as an example of the influence of biblical principles and the validation of the biblical Christian worldview, the principle of prayer saturated all levels of early American society, and based on the eyewitness testimony of certain Founders, there would be no US constitution, as was created and ratified, without Christian prayer.
So, this "Christian system of morality" means "prayer"? That is, if I gather and lead my troops in prayer to Jesus before I go out and slaughter another tribe of Natives, that's "Christian morality"?
No, don't answer that. I am just being facetious.
But seriously: you didn't answer my question. What does this "Christian system of morality" mean? Non-christian "nations" pray... and are successful.
Of course, you being American and citing the US Constitution as an example for "Christian morality", you would be wanting to point to the United States as "THE prosperous nation".
But here someone who has studied history would have to disagree with your reasoning.
1. The USA are, overall, a prosperous nation. It is also among the western nations the one with the highest wealth gap and examples of abject poverty among large groups of its population.
2. The USA are, overall, a prosperous nation. But as any student of history knows, every empire, society or nation will at some point face its decline. The USA are wealthy and powerful... today. Rome was mighty and powerful, too... in relation to its world, even more so than the USA are today. Great Britain once ruled an empire that spanned the globe. Both empires lived longer than the USA exists today. And I haven't even mentioned the prime example: China. A nation, a culture, a society... wealthy and powerful, even today... and over ten times as old as the USA.
3. The USA are, overall, a prosperous nation. But this prosperity is not owned to its "Christian morality system" (whatever that may mean). Historically, a main factor in this wealth was geographical and historcial. A country free to exploit the vast resources of a major landmass, unrestricted by political bounds that would siphon of this wealth. Established on the verge of the industrial revolution, amplifying the potential of these resources. A political and economical system that promoted the gathering of wealth... and didn't ask who owned it previously.
4. The USA are, overall, a prosperous nation... but they are not a "Christian" nation. Of course, there is a lot of Christian influence in its culture and society... but this very Constitution that you cite was carefully crafted to NOT make the USA a Christian nation. Some of the founding fathers were Christians. And some where... not so much.
Much, if not most, of the political and socio-political structure of the USA is not based on Christianity in any form, but on the political philosophied of the Enlightenment Era.
5. The USA are, overall, a prosperous nation... but the most fundamental value of this prosperity is pure naked GREED. Of course, if you want to claim that as the basis of your "Christian system of morality"... it's fine with me.