Well since Tolkien was a friend of CS Lewis, who wrote chronicles of Narnia, who was a Christian, from the analogies in his novels to how Christianity works.
It has to be.
Unless he was another type of believer like the other ones I can’t remember the names of, that some of you are. Because there are like five or more different names of people who believe in the God we believe.
So are you referring to as in he believed in God, and didn’t have last minute doubts.