Romans of course writes that Christians aren't "in the flesh." Being in the flesh is reference to being after the "old man" or sinful nature, which of course would mean not saved yet! It's in us, but we are not in it!

The Christian life is not our living a life like Christ, or our trying to be Christ-like, nor is it Christ giving us the power to live a life like His; but it is Christ Himself living His own life through us; 'no longer I, but Christ.’” -MJS