Reasonable people who who know and believe the truth, don't take scriptures out of context
That is totally true. And no one has shown that I've done any such thing.
and splice them together with another scripture, leaving out the parts they choose to ignore to create a man made doctrine that supersedes the rest of scripture.
This is totally confused. Nothing has been spliced.
What you've not admitted is that both verses speak of the gifts of God. 6:23 describes one of God's gifts, which is eternal life. 11:29 teaches that God's gifts are irrevocable.
The ONLY WAY to dissociate 6:23 from 11:29 is IF Paul made specifically clear that eternal life was NOT one of the gifts of God that are irrevocable. No one can prove that. Because Paul never taught that.
If Paul didn't mean that ALL of God's gifts are irrevocable, 11:29 would have had to indicate that. But it doesn't do any such thing.
For the wages of sin is death, but the free gift of God is eternal life in Christ Jesus our Lord. for the gifts and the calling of God are [is] irrevocable.
There you go: the gift of eternal life is irrevocable.
Then you claim, based on this "interpretation", that it is not necessary to continue to believe any longer in Christ, because now the person has eternal life in which can never be revoked.
The problem continues with your unbiblical "interpretation" by claiming that one must continue to believe. Paul never taught that. One isn't saved by continuing to believe. They are saved WHEN they believe and then they ARE SEALED with the Holy Spirit for the day of redemption. Eternal security.
All someone has to do is examine the life of Judas Iscariot, to see just how unbiblical your man made "theory" really is.
This ought to be interesting.
Judas "heard the voice of Jesus", and "followed Him for three and one half years", was an Apostle being sent with the others and preached the Gospel and worked signs and wonders, and cast out devils.
How 'bout that! And so did the crowd in Matt 7:21-23, where Jesus told the lot of them; "I never knew you. Depart from me, you workers of iniquity."
He then betrayed Jesus Christ.
He sure did.
He was NEVER saved. What would give anyone such an idea?? As I pointed out, he did the same things the crowd in Matt 7:21-23 did, and Jesus NEVER KNEW them.
Just to jog a few memories,
21 “Not everyone who says to Me, ‘Lord, Lord,’ will enter the kingdom of heaven, but he who does the will of My Father who is in heaven will enter.
22 “Many will say to Me on that day, ‘Lord, Lord, did we not prophesy in Your name, and in Your name cast out demons, and in Your name perform many miracles?’
23 “And then I will declare to them, ‘I never knew you; depart from Me, you who practice lawlessness.’
See? They prophesied in His name, they cast out demons in His name, and they performed many miracles in His name. No different than what Judas did. And Jesus told them He NEVER KNEW THEM.
Pretty clear, imho.
The missing ingredient in both Judas and the crowd in Matt 7:23 is they never believed in Him for eternal life. They thought they could earn their entrance into heaven. They thought they could impress our Savior.
But...no such deal. They went to hell. They never believed.
I've pointed this out many times, but it's clear it needs to be taught again.
Paul's answer to the jailer who asked him what he MUST DO to be saved refutes any man made notion or assumption that one must continue to believe in order to continue to be saved.
Paul's answer, in Acts 16:31 - They said, “Believe in the Lord Jesus, and you will be saved, you and your household.”
The tense for "believe" is aorist. If continuance of believing is necessary in order to stay saved, then Paul's answer was quite misleading. Because his use of the aorist leaves out ANY notion of continuing time.
So, let's just admit that your assumptions and opinion are unbiblical.