Romans 12:2- "Do not conform any longer to the pattern of this world, but be transformed by the renewing of your mind. Then you will be able to test and approve what God's will is–his good, pleasing and perfect will."
Conform- 1) to comply 2) to act in accord with the prevailing standards, attitudes, practices, etc., of a society or a group 3) to be or become similar in form, nature, or character. Clearly, we are to be opposite of the culture in which we live. The way we do this is by being transformed (changed completely) in our deepest parts. Our minds should be made new, and the way to effect this change is by living and breathing in the Word of God. It is only when we are in step with Christ that we will know the will of the Father. People often ask, "How will I know God's will for this or that?" Simply put, if we are always seeking God, and we fill our hearts and minds with Him, we will know what will please Him. Us looking like everyone else doesn't please God; He requires us to stand out as His children...to be different...completely.