And I saw any man can be inhabited by the Holy Spirit not just the leader of the ‘church’.
But, as we pray, ponder and learn together as a community, not as individuals, the fallibility, thanks to God's grace, decreases.
Hence, as a community, the church rejected the ideas of gnosticism, arianism etc., as a community the Church in council prayed over and pondered over the canon and we have the canon with us now -- as a sub-section of the Word (The Word of God being Christ of course the written Word being not "The Word" solely).
Due to our fallible nature we of course have different interpretations of different inerrant verses, yet the Holy Spirit guides the community as a hold that is to endure to the end, to stick true to orthodoxy - The Church is the community of all men, the Faith is that what has been taught as handed down by Christ through the Apostles holds true.