Therefore we are buried with him by baptism into death: that like as Christ was raised up from the dead by the glory of the Father, even so we also should walk in newness of life.
Note 6 at Ro 6:4: This verse states our death with Christ (see note 7 at Ro 6:6) as an accomplished fact and our resurrection with Christ as what should be the result of that death. That might lead some to speculate that our death with Christ to sin has already been accomplished, while our resurrection with Him (in context, spiritual resurrection) has yet to be accomplished. Yet comparison with other scripture will reveal that is not so.
Eph 2:5-6 states our spiritual resurrection with Christ as an accomplished fact that happens at salvation. Col 2:12-13 makes the same claim. In Col 3:1, Paul used the reasoning that if we are risen with Christ, then we should seek those things that are above. Just as surely as all Christians are to seek heavenly things, likewise, all Christians have been raised with Christ.
Our spirits (see note 3 at Mt 26:41) died to sin and are already resurrected with Christ unto newness of life. These things are already realities in our new spirits. Yet to see these facts become realities in our physical lives, we have to first know what happened to us in our spirits at salvation and then believe this good news. To the degree that we think, believe, and act like who we are in our spirits, to that degree we will experience the life of Christ in our flesh.