How do we know that the Holy Spirit is essential for true religion?

True religion hinges on the active involvement of the Holy Spirit. In the sermon, it is noted that without the Holy Ghost, there cannot be genuine spiritual religion. The Spirit convicts individuals of their sin, brings about new birth, and continues to work in believers to grow them in grace. It is through the Spirit that believers can experience a true, heartfelt relationship with God and understand the Gospel's profound truths. The Spirit's work ensures that salvation and any form of religion remains centered on Christ and is a divine work, not a human effort. This clear dependence on the Holy Spirit distinguishes real faith from mere outward religious practices.