Well then dust your feet and retire from this thread since all you have done is side step valid questions and wrangle over words. By your own definition of "depart" Scripture is plain that men will depart (leave) the gospel due to tribulation and listening to the doctrines of demons. In other words (Omega) you have spent the last 30 or so posts proving you are wrong.
Your analysis of John 15 and Romans 11 denies Biblical truth since Jesus said:
John 15:1-7
15:1 "I am the true vine, and My Father is the vinedresser. 2 "Every branch in Me that does not bear fruit, He takes away; and every branch that bears fruit, He prunes it, that it may bear more fruit. 3 "You are already clean because of the word which I have spoken to you. 4 "Abide in Me, and I in you. As the branch cannot bear fruit of itself, unless it abides in the vine, so neither can you, unless you abide in Me. 5 "I am the vine, you are the branches; he who abides in Me, and I in him, he bears much fruit; for apart from Me you can do nothing. 6 "If anyone does not abide in Me, he is thrown away as a branch, and dries up; and they gather them, and cast them into the fire, and they are burned. 7 "If you abide in Me, and My words abide in you, ask whatever you wish, and it shall be done for you. NAS
Jesus was addressing Jews, not gentiles and there is no indication Jesus is referring to the unsaved being the branches that are pruned.
Paul wrote:
Romans 11:11-24
11 I say then, they did not stumble so as to fall, did they? May it never be! But by their transgression salvation has come to the Gentiles, to make them jealous. 12 Now if their transgression be riches for the world and their failure be riches for the Gentiles, how much more will their fulfillment be! 13 But I am speaking to you who are Gentiles. Inasmuch then as I am an apostle of Gentiles, I magnify my ministry, 14 if somehow I might move to jealousy my fellow countrymen and save some of them. 15 For if their rejection be the reconciliation of the world, what will their acceptance be but life from the dead? 16 And if the first piece of dough be holy, the lump is also; and if the root be holy, the branches are too. 17 But if some of the branches were broken off, and you, being a wild olive, were grafted in among them and became partaker with them of the rich root of the olive tree, 18 do not be arrogant toward the branches; but if you are arrogant, remember that it is not you who supports the root, but the root supports you. 19 You will say then, "Branches were broken off so that I might be grafted in." 20 Quite right, they were broken off for their unbelief, but you stand by your faith. Do not be conceited, but fear; 21 for if God did not spare the natural branches, neither will He spare you. 22 Behold then the kindness and severity of God; to those who fell, severity, but to you, God's kindness, if you continue in His kindness; otherwise you also will be cut off. 23 And they also, if they do not continue in their unbelief, will be grafted in; for God is able to graft them in again. 24 For if you were cut off from what is by nature a wild olive tree, and were grafted contrary to nature into a cultivated olive tree, how much more shall these who are the natural branches be grafted into their own olive tree? NAS
Just where do you get the idea that all gentiles were grafted into the natural olive? Only believing gentiles are taken from the wild olive and grafted into the natural olive and if those grafted in do not continue in the faith they will be cut off.
Those who listen to friends who teach false doctrines that are not founded on God's truth they are in fact fulfilling what Paul wrote in 1 Timothy 4:1 since God cannot lie.
Now since you admit that salvation comes through both believing in the heart and confessing with the mouth that Jesus Christ is Lord to deny that actively gay Christian's can fulfill both of these requirements and still spend eternity in the lake of fire is to set yourself up as God since you claim for yourself the ability to read men's hearts and to affirm they are saved is to deny God's revealed truth as found in 1 Corinthians 6:9 and Revelation 21:7-8. I spent 5 years in gay theology and believe it or not gay theology teaches and practices your only criteria for a "genuine believer". And this also applies to most cults who teach false doctrines.
In other words (Omega) you are promoting false doctrines and encouraging people to wilfully sin by encouraging them to follow false doctrines and false teachers.
As to accepting any proof that "genuine believers" can fall away or become apostate the fact is you refuse to accept any evidence since you deny the Biblical examples given in every Bible dictionary I posted so you are condemned by your own words as a false teacher whose pride promotes heresy.
Also I see you have not recanted your heretical post concerning who is to be regrafted into the natural olive, this alone demonstrates an overbearing pride that will destroy you and any person who accepts what you say as God's truth.
I pray you will study this with an open mind and realise the error of your attitude and your doctrines.
2 Timothy 3:1-9
3:1 But realize this, that in the last days difficult times will come. 2 For men will be lovers of self, lovers of money, boastful, arrogant, revilers, disobedient to parents, ungrateful, unholy, 3 unloving, irreconcilable, malicious gossips, without self-control, brutal, haters of good, 4 treacherous, reckless, conceited, lovers of pleasure rather than lovers of God; 5 holding to a form of godliness, although they have denied its power; and avoid such men as these. 6 For among them are those who enter into households and captivate weak women weighed down with sins, led on by various impulses, 7 always learning and never able to come to the knowledge of the truth. 8 And just as Jannes and Jambres opposed Moses, so these men also oppose the truth, men of depraved mind, rejected as regards the faith. 9 But they will not make further progress; for their folly will be obvious to all, as also that of those two came to be.
NAS