I'm speaking from a purely "Christian" perspective.
I don't think the NT is an authoritative "Word of God" as many Catholics or Protestants believe today.
If the Bible was supposed to be as claimed, Jesus would have specifically and clearly spoken of such a Book. He did not. The first century Christians had no such book. Most, couldn't read. Those that could read, only had access to a few letters at one time. Today, many Christians make the belief in the bible another tenant to be considered "Christian", almost as important or equally important as the Trinity or the creeds. But, if I'm a "Christian", specifically a Gentile with no Jewish background, the OT is meaningless to me, and I believe Paul understood this.
I have a hard time putting faith in the RCC to have been truly "Inspired" to put together the "Word of God".
As for the OT, I've mentioned before, Israel IMO, painted a war mongering god, and incorrectly so and illustrated by Jesus. Muslims and Jews are an offshoot of each other, no different than "Denominations" of today with less murdering (thank god we don't have the Baptists murdering Methodists over a birthright claim).