Reading this thread alongside of the news of Notre-Dame has been an emotional tear for me. I have books of pretty much every religion as I have a bachelors in religious studies. I have found some spiritual value in all of them, or at least something that has made me go "hmmm..." That has included the Tao de Ching, books by the Dalai Llama, the Qu'ran, books on Zen, Jewish thought, or books closer to home such as Luther's Bondage of the Will, Thomas Merton, etc. Yet to see that some recommend burning something is disheartening. I'm sure there are those who probably cheered when they saw the spire of Notre-Dame fall. And just now I came across this from an Orthodox priest, Fr. Andrew Stephen Damick conclusion on Notre-Dame:
And in what is created to God's glory, God Himself chooses to dwell and to make Himself known.
So, yes, it is a spiritual loss when a church burns, especially a church that speaks so eloquently of the love and majesty of God.
It is true of course that for many of us, Notre-Dame de Paris is not "our" church in the sense that we are not Roman Catholics, and it is a Roman Catholic church. But I am very much a believer in the idea of St. Justin Martyr which he called the σπερματικός λόγος, the "Logos in seed form."
In that teaching, St. Justin says that, wherever we see the truth of Who God is, even outside the boundaries of the Church, we can affirm that. And so even with the disagreements I have with the Roman Catholic Church, I think that we can see something very clearly of Who God is in that building.
And so while it is not Christianity nor Christ that went up in flames in Paris on April 15, a voice speaking of our Lord was certainly muted, at least for a while. And that certainly is a loss.