Well, "cousin" wouldn't quite cut it because, according to the relevant Scripture usages, it could be half-siblings, cousins, nephew-uncle, fellow-Jews, or fellow-believers in Christ.
The closest in English might be "close kinsmen."
Even better would be "brothers," with a footnote explaining usage.
Your tone, by the way, is belligerent. Tone it down a bit, maybe?
Brother?
246 posted on 05/31/2016 5:06:55 AM PDT by Mrs. Don-o
(BASIC: Brothers And Sisiters In Christ.)