This dwarf-elf alliance may well be a paradigm of a Jewish-Christian friendship. Interestingly, as Saks and others have noted, Tolkien’s correspondence during World War II reveals that he himself fell into an unplanned interfaith friendship. Too old to serve in the war, he was asked at Oxford to serve on air-raid duty, keeping watch in order to alert denizens of the university town if there was a bombing and they needed to seek shelter. While on duty, he was paired with one of the most esteemed Jewish historians and Zionists then in Britain. Tolkien wrote:
I was in the small C33 room: very cold and damp. But an incident occurred which moved me and made the occasion memorable. My companion in misfortune was Cecil Roth (the learned Jew historian). I found him charming, full of gentleness (in every sense); and we sat up till after 12 talking. He lent me his watch as there were no going clocks in the place: —and nonetheless himself came and called me at 10 to 7: so that I could go to Communion! It seemed like a fleeting glimpse of an unfallen world. Actually I was awake, and just (as one does) discovering a number of reasons (other than tiredness and having no chance to shave or even wash), such as the desirability of getting home in good time to open up and un-black and all that, why I should not go. But the incursion of this gentle Jew, and his somber glance at my rosary by my bed, settled it. I was down at St Aloysius at 7.15 just in time to go to Confession before Mass.
Source: Meir Soloveichik - The Secret Jews of The Hobbit, Commentary Magazine, 11 August 2016, https://www.commentarymagazine.com/articles/the-secret-jews-of-the-hobbit/