Many Christians believe that the Bible is the word of God and treat it with reverence and respect. For them, deliberately ripping a Bible would be considered disrespectful and potentially sinful. Some might see it as unlucky due to the spiritual consequences they believe could follow from such an act.
However, others may not hold the same beliefs. Some people may see the Bible as just a book and not attach any spiritual significance to it. They may not consider ripping it to be unlucky or disrespectful.
Ultimately, whether or not someone considers it unlucky to rip the Bible is a matter of personal belief and conviction.