To be "in the flesh" and to "walk after the flesh" are two different things and the Bible carefully distinguishes between the two. We are all "in the flesh" because we live in a body of flesh. But those who are born of the Spirit do not "walk after the flesh" but "after the Spirit." Romans 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.