There are indeed many interpretations of the Christian bible, just as I’m sure there are many different interpretations of the Quran or the Torah. Some reasons may be that a person’s personal traditions, prejudices, personality, past experiences, education, and family, friends and teachers can influence how they read the Bible.
An example of how a person’s personality might lead to a different interpretation is someone who leans “toward isolation and separatism will read and apply texts in a way that differs from a person who is more inclusive and welcoming of others.” Some scholars think that if “closer study is undertaken one often discovers that what at first seemed to be a contradiction or a difference is actually nothing of the sort, but is entirely complimentary and harmonious.”