Romans 8:9

I have been reading the blog and have learned so much about Christ centered theology from the comments made by my fellow pastors and have also been reading the books recommended on the blog. I do have a question in regards to Romans 8:9 where Paul says that "if you don't have the Holy Spirit you don't belong to Christ.

Romans 8:9 (NRSV): "But you are not in the flesh; you are in the Spirit, since the Spirit of God dwells in you. Anyone who does not have the Spirit of Christ does not belong to him."

How can a person be "in Christ" apart from the Holy Spirits living in them?

My answer would be that the Holy Spirit does live in a person but the person has not yet acknowledged it therefore does not follow Christ or "belong to Him" yet in their mind?

Terry Lambert
Abilene, TX