The Bible is the inspired, inerrant word of God. However, there are errors in man's understanding and interpretation of the Bible. The Bible isn't a single book, but a collection of books written by different men, in different languages over thousands of years inspired by the Holy Spirit. The Bible did not fall out of the sky.
The
Early Church used the
Old Testament, namely the
Septuagint which was a Greek translation of the Old Testament. Christ did not leave behind a book, He did leave behind His Church to which He explicitly delegated authority. Additionally, the
Apostles did not leave a defined set of new
scriptures; instead, the
New Testament developed over time.
Writings attributed to the apostles circulated among the earliest
Christian communities. The
Pauline epistles were circulating in collected forms by the end of the 1st century AD.
Justin Martyr, in the early 2nd century, mentions the "memoirs of the Apostles," which Christians (Greek: Χριστιανός) called "
gospels," and which were considered to be authoritatively equal to the Old Testament.
While there was a good measure of debate in the Early Church over the New Testament canon, the major writings were accepted by almost all Christians by the middle of the 3rd century; however, it would not be uncommon to hear a reading from the Gospel of Mary, or The First Epistle of Clement at one church while another church may not consider the Book of Revelation to be Sacred Scripture. Obviously this did not contribute to a unity of mind and spirit. When Constantine declared Christianity a protected religion with the Edict of Milan, Church membership swelled but this exacerbated the problem of not having an official canon. In 367 Bishop Athanasius addressed the issue in his most famous work, his Festal Letter which lists the complete New Testament canon (27 books) for the first time. In 393 the Synod of Hippo took up the issue and through prayerfull discussion and debate guided by the Holy Spirit, the Council of Bishops made their recommendations and the Council of Carthage in 397 officially canonized the New Testament and by the authority granted to it by Jesus Christ in union with the Holy Spirit declared it to be the inspired, infallible word of God.
The vast majority of Christians agree that the Bible is the inspired inerrant word of God. Where we disagree is on it's interpretation and understanding which is why we have over 30,000 denominations claiming to have the truth. A more relevant and more important question is this:
Who has final authority regarding the interpretation and teaching of Sacred Scripture? For what purpose did God give us Sacred Scripture? To lead us to Jesus who will take us to the Father. If Jesus gave authority to His Church and sent the Holy Spirit to help His Church discern what was Sacred and what wasn't, then it stands to reason He sent the Holy Spirit to guide His Church in teaching Sacred Scripture. In fact Jesus says in John 14:15-27 that He would do just that.
Peace