Sounds like Latter Day saints teaching?
I believe it was Herbert W. Armstrong who had the teaching on the lost 10 tribes of Israel and how the Anglo nations like Britain, US and etc. are those lost 10 tribes. Their belief is some of that in that they believe they are the tribe of Gad. Gibraltar they through a process show is the modern name for the tribe of Gad.
In the diaspora Jews went to Germany and Spain. They find that Ashkenazi Jews are posers. They are of the ones who went to Spain and made their way to Gibraltar named for Gad, they are the real deal. They made mention of how Gad was the 7th son but then my power went down so was unable to finish. So I speculate they where going to show how that number had some special meaning. So the rock of Gibraltar is what the bible speaks of when it talks about the rock.
Catholics have it wrong as ultimately the rock that the church is going to be built upon is them and Gibraltar. They have a lot of prepper stuff as well because they are going to hold out of course in Gibraltar. As well as they find that Christ is the son of God in spirit who resided in Jesus the man. Thereby making Jesus nothing more than a human that the spirit son used for residence.
So I am sure it is much more entailed than just what I read yesterday but they are their own unique cult and look's like they use different belief systems to come up with their own.