One can only sin against God by sinning against man. One can only love God and be saved by loving and serving man. God's coming kingdom does not confirm the status quo. It judges the existing social order and re-creates it in conformity with God's sovereignty. God wants to improve every aspect of human existence.
Eschatology points to a better future for all.
Many scholars would dispute the liberationist interpretation of the coming kingdom. It overlooks the apocalyptic nature of Jesus' message. Man does not build the kingdom through political involvement, social criticism and revolutionary action. God's reign will be inaugurated suddenly, like a flash of lightning. The kingdom will arrive as an unexpected gift from God manifested in startling acts of supernatural power.