Because the Bible is all man made stories that were told hundreds of years after what really happened and each person that told the stories of the Bible to a new generation changed the story to fit the times and to fit their own purpose. The Bible and any other religious books are all based on fiction and not facts. These religious books were meant to control people and to make them afraid of thinking on their own and afraid to question what the religious leaders were telling them, because if they did they would be stoned to death or put to death in other ways. Religious leaders used these religious books to scare people and to control them. This was the only way they could stay in power and force people to do as they wished them to do using 'God' as the means to control them.
Obama says world must reach climate deal in Paris 'while we still can' (Reuters)
from the article: Were Jews ever really slaves in Egypt, or is Passover a myth?