Therefore, if anyone is in Christ, he is a new creation; old things have passed away; behold all things have become new. 1 Cor 5:17 NKJV
The power of God unto salvation (Ro 1:16) is a fantastic thing to behold. Not only does it protect or save us from the active wrath of God by keeping us from an eternal life in a hell made for Satan and his clan, the fallen angels, but the gospel's power can also "save" us from ourselves in this life on earth. However, the act of accepting Jesus Christ as our savior still does not do away with the truth that we are still human beings and thus naturally prone to choose our way (sin) over God's way (holy living). After we receive Christ we must still actively seek to do what God wants us to do. Keep in mind that the debauchery going on in Paul's day as he wrote his letter to the church in Rome was being committed by believers and nonbelievers alike.
The situation is no different today. Because Christians are still living amongst unbelievers, as we should be to be a witness to them of God's love, we are impacted by what is going on around us and must take extra precautions to protect ourselves from partaking in the activities of the world that God abhors. We need to protect ourselves so that we don't give God a bad name.
Fortunately, through Christ, all things - our old habits & thoughts - can be made new through the power of Christ working in us. We are new creations, after all, as the truth of God's word says. We can access this truth and power by a daily discipline of reading God's word and applying it to our lives. This discipline will renew our minds each day. When we see a passage that tells us how to rightly live, we can ask God to help us live that way and not our own. He will change us. He makes us that new creation when we personally ask Jesus into our lives and He will finish his masterpiece in us. God promises us that. He will save us from ourselves.
I pray for myself and for your church, my fellow brothers and sisters in Christ, from Colossians 1:9-11, that we may be filled with the knowledge of your will in all wisdom and spiritual understanding so that we make walk worthy of You, fully pleasing you. Allow us to be fruitful in every good work so that we can show the world your glory and power to change us from the inside out, making us new. Give us the desire to know your Word and to see it as the only way of life. Strengthen us according to your glorious power and make us become the men and women you want us to be. Amen.