The Langs are a model family. As we all know, something villainous is going on. Michael Faraday's suspicions and the sinister lighting and camera angles help us to draw this conclusion. Well, you'll just have to watch the movie and find out. It's a good question.
Conspiracy theories recognise that something is wrong with the world, and they look for the cause.
In Arlington Road the problem is next door'. The Bible says that the real problem is inside of ourselves. All of us have rejected God and are sorely in need of help. This rejection is the root cause of the problems in our world. Incredibly, despite our failings, God loved us so much that he sent Jesus to die in our place so that we could be offered the forgiveness that we all need.