The sbl-latex repo on github is owned by Robert Fisher. It uses a .bst file to compile the bibliography. it is very sophisticated and outputs really nice documents. I don't think it is still under active development.
https://github.com/RobertFischer/sbl-latex
However, when I wrote my thesis, I found a few things about it that I couldn't change easily, so I looked around and tried to find something a little more flexible for my own purposes. I ended up writing a class that extended the article class with minimal changes and packages. I used the CMS biblatex package for the bibliography and rely on Xelatex for unicode font support.
https://github.com/jackweinbender/sblhs-latex
sbl-latex and sblhs-latex are completely unrelated.
I am not a developer, but this produced a decent looking thesis for me. Pull requests are welcomed. I'd really like to see others to contribute to this to provide a clean working class/style for SBLHS, particularly since there will likely be an SBLHS revision in the next few years.
.zipfile and then use\documentclass{sblessay}or\documentclass{sblbook}in your.texfile. – jon Jan 13 '16 at 18:30