Oneness is no more automatic with Christ than it is with our wives. Our salvation is expressed in an ongoing process of spiritual growth in which we’re strenuously involved.
Take sexual purity, for example. At a single moment, salvation freed us to be sexually pure. But in another sense, salvation gave us only the opportunity to be sexually pure. We still must chose oneness with Christ.
“It is God’s will that you be sanctified: that you should avoid sexual immorality” (I Thessalonians 4:3). Oneness, then, is an act. While feelings of intimacy flow from oneness, oneness itself is not a feeling. It’s a state of being. Feeling regret over my sexual sins did not make me one with Christ. Preaching against sexual sins did not make me one with Christ. Walking purely makes me one with Christ. If I’m sexually pure, Jesus and I are one in this regard. If I’m not, we aren’t.