Paul encourages the Ephesian church not to live like the Gentiles do...even though they were Gentiles! He was pointing out that they were no longer part of Gentile culture but rather Kingdom culture. Paul isn't setting out a new list of laws - he's drawing our attention to a person - Jesus Christ. As we live in relationship with Jesus, read his Word and walk by the Spirit we discern how to live this completely new life.
Mark is an Elder of Christ Central Church.