Sea Breeze:
How can such consistent warnings by many different writers over 1600 years all be parables?
Your fallacy: begging the question. There is no ‘consistent warning’ about hell throughout the Bible. Later interpretations were retroactively applied to the older texts. Additionally, later authors had access to the older texts. As such, your argument is neither accurate nor remarkable. (And it wasn’t over a period of 1,600 years. Some parts could have been written around the 10th century BCE, but the stories traditionally attributed to Moses were mostly written in the 6th and 5th centuries BCE.)
Jesus spoke about Hell more than anyone else.
There is no way of verifying that Jesus said anything attributed to him in texts written decades after his death.