I would disagree with this. I think the church had quite a bit to do with improving europe after the fall of Rome. It had a lot to do with the birth of modern science. During the dark ages, monastaries were the primary source of keeping libraries and learning going. The first universities were created by the church. The father of modern genetics, mendel, was a monk. Modern hospitals came out of the church. Druing that time art, architecture, engineering, etc. made progress because the church financed and encouraged it.
It is a myth that religion is in conflict with science. What we see as science today owes its existence to religion.
There are exceptions of course. Galileo was excommunicated by the Church for his scientific views--he was subsequently reinstated posthumously with apologies by the Church. In 2000, Pope John Paul II formally apologized to all scientists and others that has been erroneously mischaracterized by well intended but misinformed Church heirarchy over the centures.
But you are correct that Christian influences enhanced the arts, great architecture, enduring music, and knowledge in all things including scientific research in the great educational institutions built mostly by the Church. Even in America, 106 of the first 108 colleges were started by Christian groups. In 1860, 229 of 246 colleges in America had been founded by Christian denominations. And despite all the errors, all the injustices, all the things the Church got wrong over more than 2,000 years, no religion has had more profound and positive influence on the world, most especailly this country, than has Christianity.
And I still deeply believe that every human is born with an instinctive sense of God, by whatever name God is called, from the very beginning.