It is implied that an unspoken reason for the preservation of manuscripts [of the Bible] is supernatural over against the loss of non-inspired works, but it is a bit more involved. Most classical works were in a region that could promise preservation on papyrus and were then recopied in Egypt and disseminated (not like the Christian monastic system). These texts were systematically copied and studied at the library in Alexandria which burned partially in the first century BC, and then the texts were also systematically destroyed by Christians in the fourth century and Muslims in the seventh and eighth centuries.
Christians are in part to blame for destroying around one million classical scrolls, and the fact that any classical texts survive in large numbers is remarkable. Centuries later, [Christians] often use the dearth of evidence [for classical works] to show the superior preservation of the Bible.
…Also keep in mind that classical works were copied, only if by chance, by [Christian] monks after the fifth century. They were left in the hands of the “enemy” so to speak to preserve and perpetuate—which they did but not as aggressively.
–Christian Bible scholar, Scott Carroll, in correspondence with Josh McDowell, printed in McDowell’s book, Evidence That Demands a Verdict, pp. 56-57