Translation
But you are not in the flesh, but in the Spirit, if indeed the Spirit of God lives in you; if however, anyone does not have the Spirit of Christ, he is not His.
Paraphrase
But you are not living under the control of natural tendencies without God, but under the control of the Spirit of God who lives in you; however, if anyone does not have the Spirit that Christ left behind living in him, he does not belong to Christ.