If a hymn is a song of faith, this one (originally from Russia) certainly qualifies.
I first heard this from Pete Seeger and more lately from John McCutcheon. It wasn't until I just checked on Youtube that I realized how popular the song was with kindergarteners. (**headslaps self for not realizing the blatently obvious**) I picked this version because the kids carried the tune through in eight different languages. There are also links to many other versions here.
BTW, this one is for my friend Beverly and her daughter Wynter.