Then, there's Fantasia! Talk about delving into religion ~ whole bunch of the old time stuff in there Fur Shur.
I think this needs clarified to note that this is possibly Disney's "first" involvement with Christianity!
I have a lot of Disney DVD's of early stuff that have a lot of Christianity in them. Disney's Legends DVD has the short story, Johnny Appleseed, featuring an Angel, the song, "The Lord is Good to Me", and describing Johnny as a devout Christian.