You said Christiandom which is defined (by websters) as 1. Christians as a whole, 2.The Christian world, 3. Christianity.
Unless you are defining it entirely differently it seems to me that Christiandom has been doing pretty well (not as well as we should however), it's anything but dormant
Abuses as defined by whom?
Seems that Calvin nailed 87(?) abuses to the door of that church. Scriptural violations by the church. Pretty straightforward
Who is it that has the infallible gift of knowing what is biblical truth and what is not? Martin Luther? John Calvin? Henry VIII? Your pastor? You?
Everyone who chooses to study the scriptures with a mind open to Jesus will see the truth. Are we infallible? no way, not even close. But as we encounter failures in our understanding of scripture we correct them and grow.
There is no infallible person on this earth. No one. Not even the pope. Proof of the popes' fallibility can be seen in the very failures that Calvin pointed out. When the french popes moved the church from Rome to France they were obviously seeking political power more than the holiness of God (some of these guys had mistresses for crying out loud). Shows me that the selection process is flawed and that the pope (and college of Cardinals) is not near to infallible.
If the reformation was intended to bring the church back to biblical truth, the people who began it (and who continue it) did a piss-poor job. Pray, which of the two zillion Protestant denominations that have spring from this "reformation" currently teaches the biblical truth?
Without getting into the all but inevitable 'my church is better' contest let's just say that all Christian churches agree on the main points of doctrine (Nicene creed stuff if I remember the title correctly) After that all is details. I personally believe that the pentecostals (Assemblies of God types) come the closest to a correct reading of all of scripture.
(Oh, BTW, the church is not made up of denominations. It's made up of people who have Christ as their Savior. It is made of Catholics, Baptists, Pentecostals, Methodists, Lutherans,Episcopalians etc. But not every one who calls themselves Catholic etc is Christian. I was Catholic for 20 years before I became a Christian (in a baptist church))
God bless and keep you