The verse says what It says: The Spirit of God and The Spirit of Christ are obviously interchangeable phrases. What do YOU think It says?
But ye are not in the flesh, but in the Spirit, if so be that the Spirit of God dwell in you.
It is not so that men in whom the Spirit of God dwells, are always in the Spirit and never in the flesh.
Rom 8:4 That the righteousness of the law might be fulfilled in us,
who walk not after the flesh, but after the Spirit.
Rom 8:5 For they that are after the flesh do mind the things of the flesh; but they that are after the Spirit the things of the Spirit.
Rom 8:6 For to be carnally minded is death; but to be spiritually minded is life and peace.
Rom 8:7 Because the carnal mind is enmity against God: for it is not subject to the law of God, neither indeed can be.
Rom 8:8 So then they that are in the flesh cannot please God.
Rom 8:12 Therefore, brethren, we are debtors, not to the flesh, to live after the flesh.
Rom 8:13
For if ye live after the flesh, ye shall die:
but if ye through the Spirit do mortify the deeds of the body, ye shall live.
LA
Now if any man have not the Spirit of Christ, he is none of his.