Act as an award-winning screenwriter with 20 years of experience in crafting suspenseful thrillers. Develop a compelling script outline about a [PROTAGONIST] who infiltrates a [RELIGIOUS CULT] in a [MODERN-DAY CITY]. The protagonist must risk everything to expose the cult's sinister practices while grappling with their own moral dilemmas and the cult's manipulative tactics. Include key plot points such as the protagonist's initial motivation, their gradual realization of the cult's true nature, and the climactic confrontation. Explore themes of faith, deception, and redemption, and ensure the dialogue is sharp and evocative. The script should keep audiences on the edge of their seats while providing a thought-provoking exploration of power and belief.