The shepherds believed the message of God told to them by the angels.
“When the angels had returned to heaven, the shepherds said to each other, ‘Let’s go to Bethlehem! Let’s see this thing that has happened, which the Lord has told us about'”. (Luke 2:15 – http://bit.ly/2QjZjE4)
Believing in God’s Word is not easy. A book written over many years, by different authors from various cultures different to yours (although inspired by Holy Spirit), is going to present some challenges.
Faith is key to overcoming these challenges. Faith to read, believe and act. Like the shepherds, you may discover God in an unexpected place.