Legal question about King James Bible

The KJV was translated 1604-1611, and had a prominent 1881 revision. So that translation is very public domain, just as much as if your characters were quoting Shakespeare or Dickens or Grimm, and you don't have to worry about legal repercussions. The Bible itself is public domain, of course, but the various translations may or may not be copyrighted, depending on the details of their creation.

Character-wise, people who use the KJV (or one of its revisions) will recognize it automatically, and often take it for granted as a "default" Bible translation. So your characters are more likely to comment on the Bible translation being used if it was, say, Douay-Rheims or Knox (which are unlikely to be used by a non-disclosed Christian sect) or a slangy modern version or something (also unlikely to be used). Biblegateway is a good resource to use, and you can read multiple translations in parallel. Many translations are public domain, but not all are likely to be commonly used in your setting. KJV should be pretty safe and easy and won't raise any eyebrows.

As lonestarlib above said, you will have no legal issue with using the KJB. A style issue might arise, however, if you are quoting verses that are relatively obscure. You might want to have your character provide the reference, e.g., "Habakkuk chapter one, verse four, says . . . "

caw

Addendum: That shot in the dark made me look it up. Habakkuk 1:4 says:

Therefore the law is slacked, and judgment doth never go forth: for the wicked doth compass about the righteous; therefore wrong judgment proceedeth.

caw