In the third book, he basically outright says he’s Jesus.
When Edmund and Lucy are told they won’t be returning to Narnia, Edmund asks if Aslan is also in the human world.
“Are you there too, Sir?” Edmund asks. “I am,” said Aslan. “But there I have another name. You must learn to know me by that name. This was the very reason why you were brought to Narnia, that by knowing me here for a little, you may know me better there.”
Is Aslan a God, or just a very old entity? I haven’t read the books.
He says quite clearly that on earth his form is a lamb instead of a lion, and the last book is a straight eschaton.
He’s 100% an allegory for the Christian God, but idr if he’s the canonical God in Narnia itself.
He’s literally sacrificed as a Christ figure
In the third book, he basically outright says he’s Jesus.
When Edmund and Lucy are told they won’t be returning to Narnia, Edmund asks if Aslan is also in the human world.
The whole book series is an allegory for the bible.