Red State (2011)

Teenagers Travis, Jarod, and Billy Ray drive to meet a woman named Sarah in response to an invitation for group sex. Along the way, they accidentally sideswipe the parked vehicle of Sheriff Wynan as Wynan is engaged in sex with another man. Wynan returns to the station and tells his deputy Pete to look for the vehicle involved.

Sarah tricks the boys into drinking drugged beer, and they pass out. Jarod wakes up in a covered cage and realizes he is inside Five Points Trinity Church, a fanatically conservative church, after he identifies church leader (and Sarah's father) Abin Cooper. Cooper begins a long, hate-filled sermon. His followers ritually murder a captive gay man and drop him into a crawl space where Travis and Billy Ray are bound together. Cooper begins preparing Jarod to be murdered in the same way, but stops when he notices Pete driving up to the church.

Travis and Billy Ray manage to cut themselves free, but are overheard by Sarah's husband, Caleb. Travis fails to escape his bonds, so Billy Ray abandons him. Caleb chases Billy Ray into a room stocked with weapons, where the two shoot each other. Pete hears the gunshots and calls Wynan for back-up, but is shot and killed by Cooper's son Mordechai. Cooper blackmails Wynan, telling him to stay away or he will reveal Wynan's bisexuality to his wife. Wynan calls Agent Joseph Keenan of the Bureau of Alcohol, Tobacco, Firearms and Explosives, who begins setting up outside the church.

Travis breaks free, arms himself and plans to shoot the congregation, but witnesses Jarod being held captive in the church. Travis instead flees the church, but is mistaken for a member by Wynan and shot. Keenan tries to reason with the group, but Cooper shoots an ATF agent. A shoot-out erupts and Wynan is killed. The ATF orders Keenan to stage a full military raid on the church to eliminate all witnesses. Keenan passes the order on to ATF Agent Harry, who refuses.

During the shoot-out, Sarah's daughter Cheyenne escapes and is captured by an ATF agent. Sarah kills him as he is about to shoot Cheyenne. Cheyenne returns to the house and frees Jarod, begging him to help her hide the congregation's children. He refuses and she attacks him. Sarah attacks Jarod, and Cheyenne accidentally shoots and kills Sarah. Jarod decides to help Cheyenne hide the children. They plead with Keenan to spare the children but are both killed by Harry. The shoot-out is interrupted by a mysterious trumpet blast. The church congregation members lower their weapons and run outside rejoicing, claiming that the Rapture has occurred and taunting the ATF.

At a government briefing several days later, Keenan reports that he head-butted Cooper and took the rest of the congregation into custody. He explains that the trumpet noises were a prank by a group of local college students irritated with Cooper. Keenan is promoted despite disobeying a direct order from his superiors. They explain that their initial decision to kill the members of the congregation was personal and that they are satisfied with incarcerating the congregation without trials, upsetting Keenan. Cooper is seen pacing around his cell singing and sermonizing until another prisoner tells him to shut up.