No, we're not perfect and human nature will never allow us to be. My friend's point instead was that we cannot compartmentalize off sections of our life with the intention of not allowing God into that area. Maybe it's our work in the marketplace. Maybe it's Friday night out with the guys. Maybe it's an addiction we feed. We all probably have several area of our lives we'd like to section off as being our "own" where we're not trying to allow God to work nor to reside. But those are exactly the places where God wants to work and reside ... the places where His son was most comfortable.
As Christians, we can never be perfect. But, we must be sold out for God in all areas of our lives ... trying to allow Him to work and even live there. We cannot live a divided nor a distracted life. God intends for us to be whole ... He can make us whole ... but we must first turn all of our life over to Him.