For me, it is the details. Disney makes sure that from the big attractions, down to a hotel room, there is a theme.
Also, the rides have a story and Audio Animatronics. I can go to Six Flags to find rides, Disney does so much more than that.
I don't know about all of that. Religion wise, I think they mostly cater to Christians (the majority in this country). I can't imagine they would do something like Night of Joy for other religions. As a Hindu, I don't really expect them to and I am ok with that.
Culturally, I think they do a good job of having maps in many languages and the head sets that explain things in many languages. Multi lingual Cast Members also help out greatly.
I agree they do lean tward Christianity, but in this country you almost can't avoid that. Hindu really? interesting. I don't favor any one religion,and don't call myself a christian. I think the universal message is clear from all religions, and more or less the same.
Basically boiled down to a fine point: Treat others as you would want to be treated by others.