JPFO accepts Gentile members. I'm one. Join up. JPFO puts pressure on the NRA. They give the NRA a chance to look reasonable by comparison.
JPFO is one of the few gun rights groups that doesn't pretend the second amendment was about hunting, target shooting, or women defending themselves against rapists. All good reasons to own a gun, but not why the 2nd amendment is critical to a free society. JPFO is about the only organization that will publically state it. I'm actually not a member, but will most likely join.