Because if you believe it is the divinely inspired word of God- a story about the human heart, character, and misgivings. It teaches us how to have a relationship with God and people. It is your choice to believe it or not.
The bible is very clear. The answer can be found in 2 Timothy 3:16,17: All Scripture is inspired of God* and beneficial for teaching, for reproving, for setting things straight,* for disciplining in righteousness, 17 that the man of God may be fully competent, completely equipped* for every good work. Although it was written a long time ago, it's counsel has proven to be beneficial in our times.
Not only we should not, but we also need not praise such a book. Of what use are the cruel codes, the frightful punishments, the falsehoods and the miracles of this ignorant and infamous book? There is nothing in all the sacred volumes of bible of any slightest value.
We know, above all, that bible is not true - that it contradicts itself. We know that the stories told in the bible are impossible, and that the miracles were never performed. Judging by the mistakes, lies, false theories, ignorant myths and foolish blunders in the Bible, it is obvious that it was written by finite impostors; by ignorant and designing men, by savages, who believed in polygamy, in slavery, in wars of extermination and genocide. We know bible has the words of evil men -- of cruel, mean, heartless, and narrow men. The laws of hatred, ofvengeance, of retaliation, the curses, threats, cruelties, menaces, filths, malices, horrors, of the bible came not from the heart of a god of infinite goodness, but from the soul of a Satan of perpetual evil.
There is in the literature of the world no bloodier code than the bible. Search the records of the whole world, find out the history of every barbarous tribe, and you can find no crime that touched a lower depth of infamy and evil than those the bible has inspired and approved of. Man, in his ignorance, tyranny, greed, lust and fear never imagined a more filthy literature than bible.
Let us free ourselves from the tyranny of this book, from the slavery of its dead ignorances, from the aristocracy of air that it preaches. Those who learned the facts of history know that, if there is a God, bible is a blasphemy. If there is no God, the Bible is a forgery. Either way, the bible is not worthy of any credit, whatsoever.
Fear and indoctrination. I will not praise a work of fiction that expects me to be okay with ethnic cleansing, rape, and incest. And which features as its main character a capricious, cruel, megalomaniac that would love nothing more than to see me struck down for thought-crime. I will be happy when this book is forever relegated to the trash heap of history, where it can no longer be used to terrify children and promote tyranny and divisiveness