Now I know as well as you do that even people who are sincerely trying to follow Jesus fall to sin, especially teenagers who are still immature and easily tempted by youthful lusts. This is not about trying to label Bieber as a hypocrite, nor is it about whether tattoos are a sin. The question I have is "Would Jesus want me to have an image of Him inked on my flesh?" Under the Old Testament God expected a physical confirmation of His covenant (Circumcision). Now, under the New Testament, God wants spiritual marks, not physical marks in our lives.
Revelation 7:3 says that God's servants are sealed IN their foreheads, not on their foreheads. Ephesians 1:13 and 2 Corinthians 1:22 explain that we are sealed with the Holy Spirit in our hearts, and there is nothing visible about that. In Hebrews 8:10 God promised that He would put His laws in our hearts and minds under the New Law. God wants inward changes, not outward changes. Those inward changes will show in our attitudes, words, and actions. Making outward changes does not necessarily impact the inner man. Instead of tattooing a picture of Jesus on our skin, we should tattoo Him in our hearts and minds.