What the author refers to as “private judgment” among Protestants is an explicit rejection of the position of the Catholic church. The number of Protestant denominations may be seen by Catholics as a mark of contradiction, but it is our strength. When you remove many of the differences in practice, there is remarkable harmony between Protestant denominations about the role of Scripture, faith, and of Christ.
Protestantism has survived the test of time for good reasons; it too, is based on the Rock, Jesus.
On the contrary. Can there be more than one interpretation of the Bible? No. The word "truth" is used several times in the New Testament. However, the plural version of the word "truth" never appears in Scripture. Therefore, there can only be one Truth. So how can there be over 20,000 non-Catholic Christian denominations all claiming to have the "Truth"?
Minor issues, not precisely spelled out in Scripture, allows liberty in beliefs and practice. But no doctrine or practice should ever be contrary to scripture - that is why God preserved it for us all as our sole authority.
The success of the Protestant Reformation was political, and to a much lesser extent doctrinal or theological. If one would point to longevity as proof, one must point to Hinduism, from 1500 BC; the Celtic religion dates back to 1000 BC, Buddhism from 600 BC, and Jainism, about the same time.
When you remove many of the differences in practice, there is remarkable harmony between Protestant denominations about the role of Scripture, faith, and of Christ.
I would disagree; given the different Trinitarian or non Trinitarian understandings amongst the different denominations (subordinationalism and Jesus-only beliefs are rife amongst the various Pentecostals and non denominationals). Free will versus predetermination is still a significant (but waning) issue amongst the non Calvinist and non Calvinist groups as well.