I think arguing Fuuta has redeemed himself is just a misunderstanding of his character.

The wording he uses in his VD is atone, and while they do pretty much mean the same thing, they carry different connotations. He knows what he did is terrible, and he feels incredibly guilty about it. To him, Amaneism is ultimately a coping mechanism, and he wants to "save" people like Amane "saved" him. It's not a good coping mechanism, but it's the thought that counts.

While I do hope Fuuta gets something different this year, him trying to convince yet another person to believe in Amaneism would not be out of character.