Unfortunately I don't have the time. The root of your serious misunderstanding of the bible is that you do not discern. You don't make a difference between true possessors and those who just call themselves christians. You don't make a difference between Israel and the Church. You dont make a difference between the old and the new. You don't make a difference between people who only tasted the heavenly gift (hebrews 6) and those have the holy spirit and no longer they live but he lives inside of them.
I am crucified with Christ: nevertheless I live; yet not I, but Christ liveth in me: and the life which I now live in the flesh I live by the faith of the Son of God, who loved me, and gave himself for me. Galatians 2:20
To whom God would make known what is the riches of the glory of this mystery among the Gentiles; which is Christ in you, the hope of glory
Colossians 1:27
If you are a new creature you are changed forever.
For it is God which worketh in you both to will and to do of his good pleasure. Phil 2:13
They went out from us, but they were not of us; for if they had been of us,
they would no doubt have continued with us: but they went out, that they might be made manifest that they were not all of us. 1. John 2:19
God wants proof and and probation and eventually you will see wether someone really belongs to him or not for he will do what is right and bring fruit. Because of the one who lives in him.
And account that the longsuffering of our Lord is salvation; even as our beloved brother Paul also according to the wisdom given unto him hath written unto you; 16 As also in all his epistles, speaking in them of these things; in which are some things hard to be understood, which they that are unlearned and unstable wrest, as they do also the other scriptures, unto their own destruction. 17 Ye therefore, beloved, seeing ye know these things before, beware lest ye also, being led away with the error of the wicked, fall from your own stedfastness. 18 But grow in grace, and in the knowledge of our Lord and Saviour Jesus Christ. To him be glory both now and for ever. Amen. 2. Peter 4
Anoother significant scripture:
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: That we henceforth be no more children, tossed to and fro, and carried about with every wind of doctrine, by the sleight of men, and cunning craftiness, whereby they lie in wait to deceive; But speaking the truth in love, may grow up into him in all things, which is the head, even Christ.
Ephesians 4:13-15
THATS biblical! :
What shall we then say to these things? If God be for us, who can be against us?
32 He that spared not his own Son, but delivered him up for us all, how shall he not with him also freely give us all things?
33 Who shall lay any thing to the charge of God's elect? It is God that justifieth.
34 Who is he that condemneth? It is Christ that died, yea rather, that is risen again, who is even at the right hand of God, who also maketh intercession for us.
35 Who shall separate us from the love of Christ? shall tribulation, or distress, or persecution, or famine, or nakedness, or peril, or sword?
36 As it is written, For thy sake we are killed all the day long; we are accounted as sheep for the slaughter.
37 Nay, in all these things we are more than conquerors through him that loved us.
38 For I am persuaded, that neither death, nor life, nor angels, nor principalities, nor powers, nor things present, nor things to come,
39 Nor height, nor depth, nor any other creature, shall be able to separate us from the love of God, which is in Christ Jesus our Lord.
Romans 8
Anything else does not know what it means that the spirit is in us and we changed in everything. You claim the the enduring is a work but that is not biblical. As someone who is really born again, who owns eternal life (GOD exists beyond time and he sees you right in heaven and you are perfect before him) it is impossible to willingly reject Christ because this is not his nature.