Here is Swami Vivekananda on the so-called prosperity brought by Evangelical Christian nations and their Armies. He was confronted in US by such evangelicals who wanted him to convert. This was his reply:
“We who had come from the east have sat here day after day and have been told in a patronizing way that we ought to accept Christianity because Christian nations are the most prosperous. We look about us and we see England the most prosperous Christian nation in the world, with her foot upon the neck of 250,000,000 Asiatics. We look back into history and see that the prosperity of Christian Europe begin with Spain. Spain’s prosperity began with the invasion of Mexico. Christianity wins its prosperity by cutting the throats of its fellow men. At such a price the Hindoo will not have prosperity.
They come to my country and abuse my forefathers, my religion, and everything; they walk near a temple and say ‘you idolators, you will go to hell’, but they dare not do this to the Mohammedans of India, for the sword will be out, but the Hindu is too mild.And may I ask you, Europeans, what country you have ever raised to better conditions? Wherever you have found weaker races, you have exterminated them by the roots, as it were. You have settled on their lands, and they are gone for ever. What is the history of your America, your Australia, and New Zealand, your Pacific Islands and South Africa? Where are the aboriginal races there today? They have all been exterminated, you have killed them outright, as if they were wild beasts. It is only where you have not the power to do so, and there only, that other nations are still alive.
If Christianity is a saving power in itself, why has it not saved the Ethiopians, the Abyssinians?”