Kenneth Cragg here, in his magisterial book on Islam and Christianity, The Call of the Minaret, is explaining why the classic doctrines of vicarious atonement and the Trinity co-inhere better with the doctrine of God as the most glorious (similar to Llull's strategy, but executed in a very different manner, obviously).
A God out of relation is certainly not theism, or monotheism... But God in relationship is precisely what we mean by the doctrine of the Trinity--God so truly and unmistakably in relation with us that we take the pattern of that relationship to us as the clue to the divine nature. What else, what better, should we take?
p. 285, Third Edition.