A dying church does not always look empty. It may still have services, programs, budgets, and history — yet its spiritual life may be fading. This expanded biblical article examines 10 warning signs of a church in decline, including lost love for Christ, weakened biblical authority, prayerlessness, inward focus, tolerated sin, unhealthy leadership, and lack of spiritual fruit. With Scripture, research, and current church attendance data, the article offers both a sober diagnosis and a hopeful call to renewal through repentance, gospel clarity, and renewed dependence on Christ.