The Infernal Gospel by Rev. Cain is a foundational text for theistic Satanism, designed as a comprehensive guide for practitioners of the Left-Hand Path. It serves as an introductory resource that covers the theology, beliefs, and rituals of modern traditional Satanism. Some reviews indicate that while the book outlines the mindset of theistic Satanism, it may not provide detailed, step-by-step instructions for practical, daily communion with demons.