In California, we have a series of "Missions" . They were founded by Franciscan Missionaries when California was still a part of Spain.
The history involved with these is ... well... contraversial ... but there is no doubt that they are very important in the history of this area. Californians take great interest in them (they are popular tourist attractions) and they are all treasured historical features. Christians (including non-Catholics) embrace them as well as mission stations that converted the Indians to the Christian faith, which many Christians think was a good thing.
Most went into ruin during the Mexican era but not too long after California became a part of the USA, Abraham Lincoln returned them (just in ruins) to the Catholic Church. Shortly most were restored - with funding from the people of California, including MANY who were not Catholics. Today, nearly all are active Catholic parishes. They all receive some funding from the State of California as historic buildings and donations from Californians, many of whom are not Catholics.
Frankly, I think it simply wise to realize that MUCH of the history of Europe and the Americas has DEEP influence from the church. Embracing that is not embracing the Truth of Christianity, per se, but it is embracing HISTORY.
Personally, I will not be donating toward the estimated 8 billion dollars to restore this treasure. BUT I hope the money is raised, and I hope a significant amount of that comes from the French government (but I doubt it; France is very socialist and leftist). NOT because Christianity is necessarily True but because history and art matters and enriches.