Well until you are willing to read and carefully consider and deal with what challenges your assertions then they are only that.
o If the gift if everlasting life ever quits, it is not everlasting.
And in short, as already explained, there is no quitting of everlasting life, but the appropriation by faith of eternal life promised to believers (1 John 2:25) and thus a forfeiting of the same by recantation of faith. Eternal life is eternal regardless, but the possession is contingent upon believing, which one who has denied the faith, which one can do, (1Tim. 5:8) has no claim to.
o If you can lose your salvation, keeping it means absolutely that you have to earn your way to heaven.
As explained, this is simply absurd. You do not earn salvation when choosing to believe, since this is due to God motivating and enabling you to do what you otherwise would not and could not. And neither is choosing to continue in the faith, to " for it is God which worketh in you both to will and to do of his good pleasure." (Philippians 2:12-13) But what you can and must take credit for is choosing to sin, to grieve the Spirit, even to the point of doing what Scripture clearly warns believers as believers against doing, as was shown, of choosing to depart from the living God, fall from grace, make Christ of no effect, to profit them nothing, and draw back to perdition.
o If you can lose your salvation, you can never get it back again, for the same reason.
Once again, as your promise is false so also is your conclusion. Once again, you can take no credit for choosing to believe, or repenting after falling away, but one can do the latter, and which is what man he must take credit for. There is a real danger of sin unto death, yet we have the promises regarding fallen brethren, "if any man see his brother sin a sin which is not unto death, he shall ask, and he shall give him life for them that sin not unto death. There is a sin unto death: I do not say that he shall pray for it." (1 John 5:16) "Brethren, if any of you do err from the truth, and one convert him; Let him know, that he which converteth the sinner from the error of his way shall save a soul from death, and shall hide a multitude of sins." (James 5:19-20)
o If I have become the possession of Jesus Christ, He will never lose me and no one can snatch me away from His grasp, not even myself.
You are His possession by faith, enabled and motivated by God, and no man can wrest you out of His hand as a believer, for that is who the promise is to, My sheep hear my voice, and I know them, and they follow me: And I give unto them [My shhep, wjho follow me] eternal life; and they shall never perish, neither shall any man pluck them out of my hand. (John 10:27,28) (John 10:27) As believers, we are kept by the power of God through faith unto salvation ready to be revealed in the last time. (1 Peter 1:5)
Thus the promise of salvation is always contingent upon believing, but as stewards/caretakers of the manifold grace of God given us (1Pt. 4:10) this does not mean we cannot choose to resist God, and sin, for obviously we can grieving His Spirit, which can extend to even "departing from the living God" through unbelief, as warned against, and Scripture does not contradict itself. as an unbeliever you have forsaken the promise of faith and preservation in Christ.
Pointing three fingers back, I myself have a problem overcoming this tendency, and do my best to be as accurate as possible without boring the reader to tears.
I do not think my paragraphical prolixity was unwarranted, as the subject sees much contention and you provided multiple arguments, and thus careful substantiation and logical reasoning was fitting.
Daniel 12:2
Multitudes who sleep in the dust of the earth will awake: some to everlasting life, others to shame and everlasting contempt.
Say!
That verse is almost your screen name!!