The Dark Ages argument and the Bronze Age argument....really not so much arguments but one-line sayings that too many atheists have used online that show they have little grasp of history. Whenever I see an atheist use those statements, I see that there isn't really much value in their intellect. Frankly, they have so much better material they could use if they weren't so lazy to research.
But if we walk in the light, as He is in the light, we have fellowship with one another, and the blood of Jesus, His Son, purifies us from all sin.