Why does the Bible have to be "inerrant"

I know the position of the forum is “inerrancy”. I don’t question anyone’s right to believe that. But I have to ask the question why?

Can a follower of Christ be solid as a rock and accept the bible as sufficient to lead us unto Christ?

Why do people argue over this point, when our lives and what God has done for us can speak volumes beyond what most often appears to be a philosophical/apologetic point?