Regarding the ritual sacrifice comment. I think it's possible for a single killer to have a ritual sacrifice type killing. If that is what the crime scene looked like, it doesn't mean that a cult was engaging in a ritual sacrifice at that scene.
Just my opinion here, but many killers of young girls like this are serial killers. They have some urge to do this type of murder and I do think this was a fantasy of RA and he acted on it. In that sense I do think it was a "ritual" for him. This may have been his first time and maybe he's never again done something like this because of the media pressure on this case and the fact he lives in the town where he committed the crime and he needed to be a law abiding citizen so attention was brought back on him after he went and gave his voluntary statement. He got lucky that they misfiled him. I think he didn't want to bring on any more attention because he knew he was darn lucky.
If this didn't get attention like it did, I do wonder if he would have committed another murder. Maybe with a similar scene left. Then it would be easy to say it was a ritual because we'd know he did the same things over again.
Just some thoughts on Mr. Click's ritual comment. I think it could be true for a single lone killer to have a ritual and I'd say murdering 2 girls is a sacrafice. They didn't assault him, it wasn't an accident, it wasn't heat of the moment.. he took them to a second location and did what he did.
Also a scene looking like a ritual sacrifice could also just be a single man staging a scene to look like something else.