If there is this alleged contradicton if both are true, debunk the alleged contradiction per the following. Which BTW can't be debunked since it's impossible to debunk the truth = Check mate.
Romans 11:21 For if God spared not the natural branches, take heed lest he also spare not thee.
22 Behold therefore the goodness and severity of God: on them which fell, severity; but toward thee, goodness, if thou continue in his goodness: otherwise thou also shalt be cut off.
Prove that to be graffed into the good olive tree does not mean to be saved. Prove, that if a Gentile that is cut off from the good olive tree after having been graffed in means this Gentile was never saved to begin with or that this Gentile remains saved, regardless. If your position is the latter then you need to prove that when the unbelieving Jews were cut off for disbelief this still equals they are among the saved, regardless. If your view is the former, then you need to prove how any Gentile can get graffed into the good olive tree to begin with without that involving them being saved first.
Why were some broken off from the natural olive tree David?
Romans 11:20 (KJV) Well;
because of unbelief they were broken off, and thou standest by faith. Be not highminded, but fear:
These natural branches of the good olive tree were NOT saved, because even though they appeared to belong to the good olive tree according to flesh, they did NOT believe.
The same is true with Gentiles who merely outwardly appear to belong to the church of Christ. According to the flesh they look no different than faithful saints. But in fact they are tares among the wheat, and shall also be broken off if they remain in unbelief.
Here are just four of the many verses of Scripture that prove the life we receive in Christ is eternal, never ending, forever life!
John 6:47 (KJV) Verily, verily, I say unto you, He that believeth on me
hath everlasting life.
John 3:16 (KJV) For God so loved the world, that he gave his only begotten Son, that whosoever believeth in him should not perish, but
have everlasting life.
John 10:28 (KJV) And
I give unto them eternal life; and they shall never perish, neither shall any
man pluck them out of my hand.
1 John 5:11 (KJV) And this is the record, that
God hath given to us eternal life, and this life is in his Son.
It seems you want to ignore these verses and cling only to the verses that show some within the church of Christ outwardly do indeed fall away from church. Ignoring the fact that they like the natural branches in the good olive tree are broken off, not because they lost their salvation, but because they were never eternally, everlastingly, forever saved, because they did not have faith of Christ or through Christ to eternally save them.
Being among those who have eternal life does not guarantee eternal life. Eternal life through Christ is according to grace through faith alone, and you know this but ignore this fact. One of the saddest passages in all of Scripture proves there will be many standing before God in judgment outwardly appearing to be saved who will hear the Lord say "I never knew you"!
Matthew 7:21-23 (KJV) Not every one that saith unto me, Lord, Lord, shall enter into the kingdom of heaven; but he that doeth the will of my Father which is in heaven. Many will say to me in that day, Lord, Lord, have we not prophesied in thy name? and in thy name have cast out devils? and in thy name done many wonderful works? And then will I profess unto them, I never knew you: depart from me, ye that work iniquity.
Luke 13:25-28 (KJV) When
once the master of the house is risen up, and hath shut to the door, and ye begin to stand without, and to knock at the door, saying, Lord, Lord, open unto us; and he shall answer and say unto you, I know you not whence ye are: Then shall ye begin to say, We have eaten and drunk in thy presence, and thou hast taught in our streets. But he shall say, I tell you, I know you not whence ye are; depart from me, all ye workers of iniquity. There shall be weeping and gnashing of teeth, when ye shall see Abraham, and Isaac, and Jacob, and all the prophets, in the kingdom of God, and you yourselves thrust out.
Many professing Christ outwardly are among the children of God who are of faith. When the Lord returns, He will send His angels to gather out of His Kingdom those that only outwardly appear to belong to Him, but are inwardly children of the wicked one, who has sown them in among the faithful children of God to offend and do iniquity.
Matthew 13:37-43 (KJV) He answered and said unto them,
He that soweth the good seed is the Son of man;
The field is the world; the good seed are the children of the kingdom; but the tares are the children of the wicked one; The enemy that sowed them is the devil; the harvest is the end of the world; and the reapers are the angels. As therefore the tares are gathered and burned in the fire; so shall it be in the end of this world. The Son of man shall send forth his angels, and they shall gather out of his kingdom all things that offend, and them which do iniquity; And shall cast them into a furnace of fire: there shall be wailing and gnashing of teeth. Then shall the righteous shine forth as the sun in the kingdom of their Father. Who hath ears to hear, let him hear.
The only way to reconcile the contradiction you force into the Word of God by saying children of God (believers) can lose their salvation is by understanding that God throughout His Word warns us of those who are of the evil one among us seeking to draw the children of God into sin. For that reason if we are not careful we may read the warnings of falling away as being to faithful saints. But when we use ALL that is written we discover we can have joy and peace in Christ, knowing He has given us eternal life and nothing in this world or heaven can take us from Him. Only those who are in fact of antichrists shall be cast away from faithful children of God because we who are of saving faith have the Holy One of Christ within us teaching us all things.
1 John 2:18-20 (KJV) Little children, it is the last time: and as ye have heard that antichrist shall come, even now are there many antichrists; whereby we know that it is the last time.
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. But ye have an unction from the Holy One, and ye know all things.
I've shown you how the contradiction you force upon the Word of God may be reconciled, will you now embrace the truth and realize the spiritual life we have when we have been born again through the Spirit of Christ in us shall NEVER END?