Exactly why should anyone accept the Bible as being true? Looked at coldly it's an ancient book written over a period of 1,600 of years, and then assembled in various manners. Sometimes this was done according to a set of rules for inclusion, sometimes by the decree of church authorities, and sometimes by vote. Of course, it's been contended that all of these actions were guided by the god mentioned in these "books," which is fine, but hardly carries any weight with the non-believer who still has to be convinced that such a being actually exists.
However, I doubt these elements entered your mind when you decided the Bible was true, so how did this come about? Was it that the message of Christian salvation was so appealing that its source, the Bible, just had to be true? Or was it the appeal of the Bible's writings themselves that convinced you of its truth?
In any case, what is your argument to the non-believer that the Bible should be accepted as true?
The Bible, dear friend, should be accepted as is true because ___________fill in the blank________________ .