Catholic Position

¶889 In order to preserve the Church in the purity of the faith handed
on by the apostles, Christ who is the Truth willed to confer on her a
share in his own infallibility. By a “supernatural sense of faith” the
People of God, under the guidance of the Church’s living Magisterium,
“unfailingly adheres to this faith.”

¶891 “The Roman Pontiff, head of the college of bishops, enjoys this
infallibility in virtue of his office, when, as supreme pastor and
teacher of all the faithful – who confirms his brethren in the faith he
proclaims by a definitive act a doctrine pertaining to faith or
morals…. The infallibility promised to the Church is also present in
the body of bishops when, together with Peter’s successor, they
exercise the supreme Magisterium,” above all in an Ecumenical Council.
When the Church through its supreme Magisterium proposes a doctrine
“for belief as being divinely revealed,” and as the teaching of Christ,
the definitions “must be adhered to with the obedience of faith.” This
infallibility extends as far as the deposit of divine Revelation itself.

¶890 The mission of the Magisterium is linked to the definitive nature
of the covenant established by God with his people in Christ. It is
this Magisterium’s task to preserve God’s people from deviations and
defections and to guarantee them the objective possibility of
professing the true faith without error. Thus, the pastoral duty of the
Magisterium is aimed at seeing to it that the People of God abides in
the truth that liberates. To fulfill this service, Christ endowed the
Church’s shepherds with the charism of infallibility in matters of
faith and morals. The exercise of this charism takes several forms:

¶2051 The infallibility of the Magisterium of the Pastors extends to
all the elements of doctrine, including moral doctrine, without which
the saving truths of the faith cannot be preserved, expounded, or
observed.

Scripture Says

Romans 3:23
23  For all have sinned, and come short of the glory of God;

Romans 3:10
10  As it is written, There is none righteous, no, not one:

2 Corinthians 5:21
21  For he hath made him to be sin for us, who knew no sin; that we might be made the righteousness of God in him.

Hebrews 5:9
9  And being made perfect, he (Jesus) became the author of eternal salvation unto all them that obey him;

Commentary

• Where do fallible men get authority to declare other men infallible?
• If others than Jesus are infallible, then God must be wrong.