What one believes about soteriology will affect their ecclesiology (doctrine of the church). In their attempt to "give man who isn't really all that bad the help that he needs," the Postmodern Movements of our day highjack God's design for the church and defile themselves with the world which is the logical and second symptom of apostasy. These apostate movements have no idea what God's design for the church really is! But do we really expect them to understand ecclesiology when they don't understand soteriology? Having departed from God's Word in soteriology they have departed from God's Word in ecclesiology and are defiling themselves with the world.
God reveals His design for His church in His Word. For a sound doctrine of soteriology one needs to study the book of Romans and for a sound doctrine of ecclesiology one needs to study the book of Ephesians. In Ephesians we come to understand that God's design for His church is the equipping of the saints for the work of the ministry. We also come to understand what an equipped saint is like - "As a result (of being equipped), we are no longer to be children, tossed here and there by waves and carried about by every wind of doctrine, by the trickery of men, by craftiness in deceitful scheming (Ephesians 4:14). And we also have the picture of the equipped saint as one that has on the full armor of God - "so that you will be able to stand firm against the schemes of the devil. For our struggle is not against flesh and blood, but against the rulers, against the powers, against the world forces of this darkness, against the spiritual forces of wickedness in the heavenly places" (Ephesians 6:11-12).
This is not the goal of the Postmodern Movements in ecclesiology! Their goal is to "be like the world to win the world" and use every "gospel gimmick" under the sun to bring people to church. They believe that the church is the "evangelizing place of sinners" rather than the "equipping place of the saints." The evangelizing of sinners is primarily to take place by the equipped saints as they go into all the world.
You cannot equip the saints while evangelizing sinners - the saints have already been evangelized and that is why they are saints. You cannot evangelize sinners while equipping the saints - sinners have not been evangelized and therefore cannot be equipped. The church is not the evangelizing place it is the equipping place so that equipped saints go and evangelize sinners. To do so means that one is entering enemy territory and he or she must be properly equipped for the battle that will ensue. That is God's true design for the church.