There is sometimes a misunderstanding or differing opinion of who wrote what in the Bible. Is this issue relevant to any particular Christian sect? Does the topic play an important role?
As a Catholic, you study the books of the bible taking into account to whom the books were written.
The Catholic faith is based on Scripture and Tradition (with a capital 'T'). We realize that in the early church, many things were passed down by word of mouth. In other words from the Catechism of the Catholic Church:
As far as I can tell, there is not great importance placed on who specifically wrote a book, but the author is taken into account while reading the scripture.