JRRT did do his works based upon the desire to create a Mythology for the people of the British Iles. It seemed that unlike most of Europe, Britain didn't have a historical mythology of its own. It is also said that the 'Briton' (those who were in Briton before the Anglo-Saxons arrived. Note: of 6,000 burials discovered from the immigration of the Anglos and Saxons into Briton. No proof of 'violent deaths' was found as if the land was won over by battle against the Britons. Just a case of superior numbers and breeding by the Anglos and Saxons which the areas of Wales and Cornwall remained as Briton) story of Camelot was not only a fictitious propaganda of its day (before being Christianised, like Hollywood changing
Tolkien's work to be more Woke/PC/etc) - but also, that it was also a 'borrowed' version of story from mainland Europe so long ago. The
peoples of Britain before the Britons, were instead basically wiped out but for handfuls of women to be concubines as Genetic Tracing shows.
So back to his Mythology. JRRT's works are just something for the British to be proud of. A 'history' that although still based on mainland mythologies, is something adapted for the British to call their own.
If it 'evolves' into a Religion? Well, it was created in 'book' form - so a 'Temple' (Church is for Christianity) for Tolkienism can be more than justified and would only help preserve his work for generations to come.
Writing was created in Sumeria long ago. The Priests of the Temple of Ur worshipped 'Sin' or Ab-Sin-Nanna (in Sumerian) which is what we call the Moon today. Sin 'inspired' the Priests of Ur to 'create' Writing and long before Zarathustra used it to create the first Religion formed from local Pagan stories to make a 'Duality' for the first time. Writing was primarily used for 'logistical' reasons and record. Look closely at the two words: Ur and Sin... Sin-Ur (Sinner). You now see where Writing changed the world in the Middle-East with the Hebrew using writing and Zarathustra's works to create their own 'immortal' recording of the bloodline from their own Adam/Eve story to thus create the first of three Monotheisms (funny how there isn't a 'one' monotheism to symbolise the 'One
God' aspect. Lol)
So yes, Tolkien Fans can form a 'Temple' for his works. This Forum, in a way - is like a Temple.
As for the poor people before the Britons came into those
islands, well - before 6,000+ years. The British Isles was mostly inhabited by nomadics that came and went within the changes of the Ice
Ages, when they were habitable. But like I said, they were hunted out by the first 'permanent' Britons so long ago. So in truth, Britain is basically a non-indigenous non-first-people nation. Especially when 'Neanderthals' (possible inspiration for stories of
Ogres) were the first ones there much longer ago and for far longer still.