What significance does the Old Testament have?

In relation to our article the-bible-the-hawking-index-and-the-case-for-critical-en

Bob Pearce, Adelaide SA, Feb 25, 2025

I was brought up in a Protestant household and attended church twice most Sundays until I left home at 19. I cannot understand how Christians can apply so much significance to the Old (largely Jewish) Testament often at the expense of the New (completely Christian) Testament.

The first is about a vengeful God not unlike most mythological stories and the second is about a compassionate, all-forgiving Son of God.

It is like comparing the medical practices of the Crimean war to modern day medical practices; a reference to what once the practice of sawed bones and now we have surgeons.