I think we can solve several problems at once if we just assume each member of the Trinity has a different fursona
Okay but is Jesus a lion or a lamb though?
Jesus is the Lamb. You might think he's the lion, given his very Jesus-like behavior in The Lion, The Witch, and the Wardrobe... But if you read The Magician's Newphew and The Final Battle you'll realize he's also the one who created Narnia and he'll be the one that destroys it at the end. He's big-G, not Big-J.
The Wardrobe is St. Peter*, as he guards the entrance to God's Country.
(Or more metaphorically, the Church. It's God's representative on Earth)
* I almost called him Saint Paul, because I was thinking of "The walrus was Paul" from the Beatles
I mean saintly fursona is not unheard of. The Catholics for sure got their evangelist Tetramorph: John - eagle ; Luke - bull; Mark - lion; Matt - angel