Not bad. I can tell that you have potential to get much better, but there are various improvements that can be made to this. Firstly, the usage of both 2D and 3D art is a little jarring, I suggest choosing and sticking to one. Also, while the art itself isn't bad, the animation lacks fluidity. It feels really stiff, almost as if you're just jumping between key frames without really imagining the movement as one complete motion. The lip-syncing could use some work as well.
But it's not all bad, there are some nice moments here. You have a good directing style, and I can see what you want to convey. It's just that you're having a bit of trouble actually getting it across. The story felt pretty simple, but it isn't uninteresting. The premise is nice, but the characters weren't fleshed out. To be frank, they were boring, but given the length of the short you did what you could. I suggest focusing more on individual characters rather than exposition.
For example, instead of opening with the priest you could have open with Hellami, whom seems to be the main character of this whole show. You could have used her to introduce the Redies, who George is, and various other pieces of exposition while also showing what her personality is through her descriptions of the people. I understand that you want to keep her mysterious, but without a character of some sort to relate to, the audience will feel detached from the story.
I enjoyed the short, and hope to see your work improve in the future. For now, Hellami gets a 3.5/5.