When a descendant of Cain commits murder, the statue of Cain becomes alive to exact revenge, and the killer is…A child!

You have me with bringing in “Cain” but the rest makes me question. My first response was aren’t we all children of Cain (within the scope of that story)? Cain, Able, and possibly Seth were the children of Adam and Eve. No children are mentioned for any of them, but only Cain has any mention of a wife and going off to live life (according to what I just looked up, forgive me if I’m wrong). Your story might address this, but here in the logline it makes me scratch my head. Second thing you had me with is the statue coming to life. However, and this might just be me, the fact the child is the killer doesn’t grab me the way it clearly is intended. I’m neutral on it. If I had this logline in front of me and the synopsis, I would read the synopsis, but I might not ask for one if I just got the logline. I don’t know what I need, cause I’m still trying to learn logline writing, but I know I need something more to fully nab me. Sorry I can’t be more helpful and say “it needs this!” Good luck!