Romans 12:1-2: Yeah I'm A Christian . . . So What?
Romans 12:1-2: I appeal to you therefore, brothers, by the mercies of God, to present your bodies as a living sacrifice, holy and acceptable to God, which is your spiritual worship. Do not be conformed to this world, but be transformed by the renewal of your mind, that by testing you may discern what is the will of God, what is good and acceptable and perfect. 
You can probably name people who claim Christianity, but their lifestyles fail to reflect their values. In Romans 12-16, Paul explains how the truths of Romans 1-11 transform daily life.  We need to understand that the realities in the first eleven chapters of Romans lead into the last four because “union with Christ” enables our new obedience.  Just as the Trinity converts people,  God also enables Christ-like living.  This Christ-like living is, “by the mercies of God,” a joyful worship that holistically engages the body, mind, and soul in rational, actual, and emotional opposition to sins in pursuit of the LORD. 
Why would you not want to live this way? Yes, Christ-likeness requires the humbling process of confession, and living in a manner contrary to our pre-converted nature, but those things are God’s grace.  Imagine the joy of not living for this corrupt,  transient,  fading  world, but something eternal, true, and worthwhile. Embracing Christ exclusively, whether for the first time in conversion, or in repentance, brings that joy.  Freedom from enchaining human and personal expectations rests in converting to and living by God’s covenant expectations. 
 The Holy Bible: English Standard Version. (Wheaton, IL: Standard Bible Society, 2016), Logos Bible Software. All Bible references will be ESV from here on out, unless noted otherwise.
 James Montgomery Boice. Romans: Volume 4, The New Humanity Romans 12-16. (Grand Rapids, MI: Baker Books a division of Baker Book House Company, 1995), 1484.
 John Murray. The Epistle to the Romans: The English Text With Introduction, Exposition And Notes Vol. II. (Grand Rapids, MI: Wm. B. Eerdmans Co. 1965), 109. See also The Westminster Standards: The Westminster Confession of Faith, the Larger Catechism, and the Shorter Catechism. (Philadelphia, PA: Great Commission Publications, 2011), Shorter Catechism Questions and Answers 86-87.
 Romans 3, 5:1-2, 8:12-39, 9, 11, Galatians 4:4-6; Ephesians 2:1-10; Philippians 2:6-11; Colossians 2:6-15, etc.
 Psalm 57:2; Philippians 1:6; 1 Thessalonians 1:3, 5:24.
 Murray, Romans, 111-114.
 Paul David Tripp. What Did You Expect? Redeeming the Realities of Marriage. (Wheaton, IL: Crossway, 2010), 73-80.
 Romans 1:18-32; 3:9-23, 8:7-8, 8:18-23.
 Murray, Romans, 113-114.
 1 John 2:18.
 1 Peter 1.
 Galatians 2:4, 5:1, 5;13; Romans 6:15-23, etc.