The movie plot draft

I finished writing this a few minutes ago, it didn't take too long, incorporates our main plot ideas, but I had to be creative with making the rest of the story after Chris finding the strange bible (Note-this is not the final draft, probably, and names, content, ideas etc are subject to change over the next few meetings)

Here is my draft plot summary:
The movie is about an autistic teenager with strong obsessive tendencies, who discovers a strange insignia in an old and strange bible, filled with annotations, and on each page is this strange symbol. Chris becomes obsessed with the symbol and sets out to find out what it means. By studying the book closely and following the clues he wrestles from the anonymous annotator’s scrawlings, he is led to a dingy crypt beneath an old, abandoned church. Here he finds a small cult dedicated to cleansing the world of sin. With his search finally complete Chris is happily drawn into their rituals, led by an obsession about the strange symbol, and becomes obsessed with the cult’s cause as well. Seeing how impressionable and innocent he is, the cult leader manipulates Chris and sends him off to carry out his bidding. Under the impression that he is pleasing God, Chris carries out his master’s wishes without a second thought, burning certain buildings down, trashing a church, and assaulting a priest. Until Chris is sent on more evil missions, and murdering ‘sinners’. These select targets are ones who will go unnoticed, and he makes the killings seem self inflicted, until the cult leader orders his to physically murder the most hateful sinner (in their eyes) and absolve the planet of his presence, thus pleasing God greatly (theoretically). Whilst all the while the police are investigating and an intrepid young detective believes the attacks and killings to be connected, and sets out to track down the young protagonist. Until an attack on his own life is made and Chris is captured. He then coerces Chris (without use of force, Chris is co-operative as he has lost faith in the cause, and wants to make amends to God) into disclosing the location of the cult and their leader. Chris then leads them to the crypt, the cult members are arrested, but then seeing the destruction of his very cause the cult leader stabs Chris, who then seeing his chance to absolve the world of the very evil he believed to be good, takes the knife from his chest and stabs the cult leader in return. The cult leader dies, all willing to live gone from him, whilst Chris lays in the detectives arms and smiles, confident that he has earned his place in heaven.

Any corrections or adaptations shall be posted forthwidth. I state again, this is just a draft.