Seriously?
Unsaved people don't have an "inner man"?
What are they then?
Just hollow shells?
Our inner man relates to our spirit and soul as contrasted to our outer man or our bodies.
Ephesians chapter 3
[14] For this cause I bow my knees unto the Father of our Lord Jesus Christ,
[15] Of whom the whole family in heaven and earth is named,
[16] That he would grant you, according to the riches of his glory, to be strengthened with might by his Spirit in the inner man;
[17] That Christ may dwell in your hearts by faith; that ye, being rooted and grounded in love,
[18] May be able to comprehend with all saints what is the breadth, and length, and depth, and height;
[19] And to know the love of Christ, which passeth knowledge, that ye might be filled with all the fulness of God.
It's OUR "inner man" which is strengthened by God's Spirit that Christ may dwell IN OUR HEARTS or IN OUR INNER MAN by faith.
II Corinthians chapter 4
[14] Knowing that he which raised up the Lord Jesus shall raise up us also by Jesus, and shall present us with you.
[15] For all things are for your sakes, that the abundant grace might through the thanksgiving of many redound to the glory of God.
[16] For which cause we faint not; but though our outward man perish, yet the inward man is renewed day by day.
Would you have me/us to believe that "Christ in us" needs to be "renewed day by day"?
Seriously, just give it a rest.
According to this same Paul, here's what's being "renewed":
Romans chapter 12
[1] I beseech you therefore, brethren, by the mercies of God, that ye present your bodies a living sacrifice, holy, acceptable unto God, which is your reasonable service.
[2] And be not conformed to this world: but be ye transformed by the renewing of your mind, that ye may prove what is that good, and acceptable, and perfect, will of God.
Again:
Ephesians chapter 4
[17] This I say therefore, and testify in the Lord, that ye henceforth walk not as other Gentiles walk, in the vanity of their mind,
[18] Having the understanding darkened, being alienated from the life of God through the ignorance that is in them, because of the blindness of their heart:
[19] Who being past feeling have given themselves over unto lasciviousness, to work all uncleanness with greediness.
[20] But ye have not so learned Christ;
[21] If so be that ye have heard him, and have been taught by him, as the truth is in Jesus:
[22] That ye put off concerning the former conversation the old man, which is corrupt according to the deceitful lusts;
[23] And be renewed in the spirit of your mind;
[24] And that ye put on the new man, which after God is created in righteousness and true holiness.
Yet, again:
Colossians chapter 3
[9] Lie not one to another, seeing that ye have put off the old man with his deeds;
[10] And have put on the new man, which is renewed in knowledge after the image of him that created him:
Does "Christ in us" have to be "renewed in knowledge"?
It's nonsense.
Anyhow, Paul explained EXACTLY what he meant about "the inward man" when he said:
Romans chapter 7
[22] For I delight in the law of God after the inward man:
[23] But I see another law in my members, warring against the law of my mind, and bringing me into captivity to the law of sin which is in my members.
Paul spoke of "the inward man" in relation to HIS MIND.
You'd be wise to do the same.