4./ the NATURAL BODY PROFITETH NOTHING

flesh profiteth nothing
John 6:63;
It is the spirit that quickeneth; the flesh profiteth nothing: the words that I speak unto you, they are spirit, and they are life.

man (this term always refers to the creature i.e. the natural body )
Isaiah 2:22;
Cease ye from man, whose breath is in his nostrils: for wherein is he to be accounted of ?
Isaiah 2:21-22;

dwelleth no good thing
Romans 7:18;
For I know that in me (that is, in my flesh,) dwelleth no good thing: for to will is present with me; but how to perform that which is good I find not.
Romans 7:17-19;

flesh and blood cannot inherit
1 Corinthians 15:50;
Now this I say, brethren, that flesh and blood cannot inherit the kingdom of God; neither doth corruption inherit incorruption.
1 Corinthians 15:49-51;
neither doth corruption inherit incorruption

natural man receiveth not the things of the Spirit
1 Corinthians 2:14;
But the natural man receiveth not the things of the Spirit of God: for they are foolishness unto him: neither can he know them, because they are spiritually discerned.
1 Corinthians 2:13-15;

natural man/body
1./ it must first be changed - Romans 8:21,29; Romans 12:2; 2 Corinthians 4:10-11; 2 Corinthians 3:18; 2 Corinthians 4:16; Galatians 4:19; Ephesians 4:15; Phil. 3:21;

by ELOHIM HIMSELF - Ephesians 2:10; 2 Corinthians 3:18; Philippians 2:13; 3:20-21;

until
Ephesians 4:13;
Till we all come in the unity of the faith, and of the knowledge of the Son of God, unto a perfect man, unto the measure of the stature of the fulness of Christ:

FOR THE NATURAL BODY TO ENTER INTO THE KINGDOM
it must first be changed

i.e. clothed upon

translated (raptured)
take on our house from heaven
i.e. become "spiritual body"

then, it is no longer natural !

2./ THIS IS THE ONLY THING THAT "availeth"

Galatians 5:6; 6:15;
For in Jesus Christ neither circumcision availeth any thing, nor uncircumcision; but faith which worketh by love.
Galatians 5:5-7;

James 5:16;
Confess your faults one to another, and pray one for another, that ye may be healed. The effectual fervent prayer of a righteous man availeth much.
James 5:15-17;