This is would be much better if it weren't so messy. The plot is interesting, camera work is good, actors were decent and the effects were ok. For me, there are problems.
There are times where I almost felt that I was watching four different stories. Story one is about a girl and her twin sister, who is a demon or evil. Story two is about a cop who is working a murder case. Story three is about a group of boys who were sent to juvie for various reasons and came out on a mission. And, story four is about a pastor who investigates cults.
It isn't unusual to have several storylines that are interlaced and this one is but it has been done in an odd way. There are characters who are introduced but we see very little of them throughout the film. It is also a bit convoluted when it came to giving a clear understanding about all that was going on but I will be fair in saying that I was watching the film with subtitles and some things may have been lost in translation.
This is marketed as a horror film but it felt like a thriller to me. I watch a lot of horror though and I may be somewhat desensitized. Nothing about it every really rose to a level of horror. Creepy. Maybe. Not horror though.
It isn't a terrible movie. It was hard to follow.