Usually, even a non-Christian knows something about the earth, the heavens, and the other elements of this world, ... and this knowledge he holds to as being certain from reason and experience. Now, it is a disgraceful and dangerous thing for a nonbeliever to hear a Christian, presumably giving the meaning of Holy Scripture, talking nonsense on these topics; and we should take all means to prevent such an embarrassing situation, in which people show up vast ignorance in a Christian and laugh it to scorn.How true. If only this wisdom given to Augustine were not covered in centuries of dust, but were read and considered by more Christians today. How sad it is when some Christians get so caught up in testifying to their faith that they forget that how they act may be at cross-purposes with sharing that faith with others.
The shame is not so much that an ignorant individual is derided, but that people outside the household of faith think our sacred writers held such opinions, and, to the great loss of those for whose salvation we toil, the writers of our Scripture are criticized and rejected as unlearned men. If they find a Christian mistaken in a field which they themselves know well and hear him maintaining his foolish opinions about our books, how are they going to believe those books in matters concerning the resurrection of the dead, the hope of eternal life, and the kingdom of heaven, when they think their pages are full of falsehoods on facts which they themselves have learnt from experience and the light of reason?
Reckless and incompetent expounders of Holy Scripture bring untold trouble and sorrow on their wiser brethren when they are caught in one of their mischievous false opinions and are taken to task by those who are not bound by the authority of our sacred books. For then, to defend their utterly foolish and obviously untrue statements, they will try to call upon Holy Scripture for proof and even recite from memory many passages which they think support their position, although they understand neither what they say nor the things about which they make assertion.
-- Augustine (354-430), On the Literal Meaning of Genesis, I.19 (translated by John Hammond Taylor)
Update for 4/23/2017
17 hours ago