The early Christians leaders created the Bible.
Some early Christian leaders" teaching are rejected by the protestants. Eg, many early Christian leaders doesn't sounds like Calvinist at all.
Protestant argue that they put the Bible above anything else? But strictly speaking, it's their interpretation above anything else?
You bring up a good topic.
And it is a topic that has a number of VERY DIFFERENT assumptions,
in different theologies.
The topic of Authority:
Who has the authority to declare the writings that are in the canon?
The topic of interpretting the Scriptures.
Who has the authority to claim that their interpretation of Scripture, is correct.
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Protestant Fundamentalists reject that there was a STRUCTURE of
authoritative Church leadership, put in place by Christ (through the Apostles).
So, their theologies often include that the AUTHORITY to declare which
writings are in the canon of the Bible, comes directly from the Holy Spirit.
... The problem with this assumption, is that there is no "decision algorithm"
to indicate clearly who has been enlightened by the Holy Spirit.
High Church Protestants, and Catholic Christians, accept that Christ gave
"all authority in heaven and in earth" to the original Apostles. And, this
authority is reflected in the canonical biblical teachings, and also in the
leadership of the Church that the Apostles appointed, generation by
generation.
... the outcome of this doctrine is that it was the leadership of the early
Church, appointed by the Apostles, that authoritatively recognized
Apostolic teaching, and identified writings that should be in the canon
of the New Testament. Also, this leadership was authoritative in
interrpetting the Scriptures.
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Many of the Protestant Reformation leaders, do not accept the second
view of authority in the Church. And, this shows up in their different
theologies.