Zac Poonen discusses two significant movements in the Old Testament: the journey from Egypt to Canaan, representing an individual's liberation from sin and a victorious life through Christ, and the transition from Babylon to Jerusalem, symbolizing the corporate life of the Church. He emphasizes that Babylon represents a commercial mindset focused on personal gain, which can exist even within the best denominations, while Jerusalem embodies a spirit of sacrifice and selflessness. Poonen warns that true membership in the Body of Christ requires an inward transformation and a commitment to God's glory, rather than merely leaving dead denominations. He stresses the importance of gathering believers who understand the principle of sacrifice to avoid creating another lifeless system.