Verses 3 & 4 says I am dead and my life is hid with Christ in God. We are not to seek this world's philosophy because Satan is the god of this world. (2 Cor 4:4) and what do I have to do with him? Next we find that Christ is my life. This is brought out in John 14:6 where Jesus said "I am the way, the truth and the life." If Christ is my life, then I am complete in Him and when He appears we will be with Him in glory (Rev 19:14). To put to death our members means that we are not to yield to sinful practices which affects our 'thoughts" and ultimately plays out in our physical actions. The wrath of God comes upon the sons of disobedience, which is referring only to the unsaved people of this world. The last verse says we once walked in this way, but it should not be true of us anymore. Real salvation brings an inner heart change that affects not only our thought life but the resulting actions. We are to live our lives as the heavenly people we now are.