Online technologies such as social media and videoconferencing platforms have changed the way church leaders access information and communicate with congregants. The paper investigates the value of online technologies in creating church sustainability using system dynamics. Exploring Seventh-day Adventist (SDA) as the case study, the researchers interviewed 12 religious leaders. The results showed that church leaders were using online technologies to create online communities within their congregations which were crucial for addressing the communication and informational needs of various church leaders as well as aiding the retention of church members. The study concludes that online technologies have the potential to sustain religious organisations. The study provides insight to the church leaders regarding the value of online technologies in church sustainability.