Are you saying that Jesus spirit is the Holy Spirit then?Sorry Patrick, I still haven't got this quote thing figured out. to your question, "How does the Spirit of Christ live in a believer?"
I guess it would be best to tell you what I believe by quoting the Westminster Confession.:
"To all those whom Christ hath purchased redemption, He doth certainly...(make) intercession for them...persuading them by His Spirit to believe and obey, and governing their hearts by His...Spirit..."
Christ does have a Spirit. I believe He is Very God. God is a Spirit.