no one interested in offering what they believe to be key events in the timeline of Christianity?
The first two that come to my mind are the conquests of Alexander the great(356-323 BC) and the fall of Constantinople (1453 AD).
The conquests of Alexander made the Bible as we know it possible and created the stage for the birth of Christ.
The fall of Constantinople was a key spark in the fire that became the reformation. If Hagia Sophia had not become a mosque, the Pope would not have felt so strong a need for a great basilica in Rome and the selling of indulgences for that end would not have been the fuel for Luther and the Reformation.
... Alexander the Great was a minor player in the bigger scheme of things...
You are almost getting into 'butterfly wings causing hurricanes' here. True concept. But it can get nearly scatological.
Many, many events work together to forge history.
And you are not looking at what matters to God who really forges history: do you not realize the influence towards the fall of Rome that the mass martyrdom of Christians had?
God sees those things.
Look at the fall of Israel for instance. Don't think that ultimate destruction was fast, though it all came down fast. It was built up through increasing corruption through the entire time. Only reason the city was allowed to not be destroyed more quickly was for the rise of the Church.
But considering the major nations of the Free World are Christian majority, and at their founding even moreso, you are talking about nearly the entirety of historical progress in the West these past two thousand years...
As for key players... even that is a list too long to mention, but there are the Christian martyrs... there are the luminaries such as Joan of Arc, Francis of Assisi, Teresa of Avila, St Catherine, St Margaret, and many, many others...
Real history has always been made to relatively small audiences: but the important member of that audience is God.