Christianity is the West
Those losses actually pale in comparison to what Christianity has lost in the last century alone of the greatest of its several heresies - the Heresy of Modernity.
The abandonment of Christianity as a foundational aspect of Western civilisation has led the Western nations utterly astray. There is no longer any moral guiding principle to those nations - many of which no longer understand what a "nation" really is anymore.
Only by re-instituting an aggressive, forward-looking Christian faith, can the nations of the West hope to reclaim their lost glory and power. There is no power on Earth greater than that of the Almighty, and it is His strength that we need now in order to defend the greatest civilisation the world has ever seen.