Is it fair that the book of God was not available to some people in history?

If life were truly fair, then Christians would have the same access to the Vedas and the Dao de Jing as Hindus and Daoists have to the Christian Bible, and so on. But even access is insufficient, since fairness would require Christians, Hindus, Daoists and others to put aside their own beliefs while they study what is good in the other religions and then decide which religion, if any, they would follow - something few people would do.

The religions of the ancient Greeks and Romans had their values, even if they did not have a single 'book of God', and even if they were persecuted out of existence by the emergent Christian faith. Is it fair that, because Christians of the fourth and fifth centuries so comprehensively destroyed the pagan writings, they are not available to modern Christians?