Can Hebrews 6:1-8 happen to a Christian? Do you think it is possible for this type of christian to lose his salvation, or according to 1 Corinthians 5:5, will his spirit only to be saved and not his body?
First I would like to say that Hebrews 6 is just as true as John 3. Sometimes we may not understand how two things that seemingly contrast can both be true, but we need to always trust God and lean not on our own understanding (Proverbs 3:5).
The Bible never says that a Christian “cannot” lose their salvation. That’s something that we assume, and love to hear in keeping with 2 Timothy 4:3-4. It seems to be right, but we are instructed not to add to the Word of God (Proverbs 30:5-6), and to only speak and think what is written, even in our hearts (Romans 10:6-8, 2 Corinthians 10:3-5). Check the verses.
Knowing these verses, the first thing that should come to mind whenever we hear something that seems right is “where is it written?” If it is not written, it is not needed for this life (2 Peter 1:3-4). We only know in part (1 Corinthians 13:9), but the part we know contains everything we need for life.
Read Hebrews 2:1-3 out loud a few times. I want you to read it out loud, because faith comes by hearing (Rom 10:17), and if you are accustomed to speaking against what is written, like millions of Christians today, then you may not be able to see it if you don’t read it out loud (1 Timothy 6:20-21).
1 Therefore we must give the more earnest heed to the things we have heard, lest we drift away. 2 For if the word spoken through angels proved steadfast, and every transgression and disobedience received a just reward, 3 how shall we escape if we neglect so great a salvation, which at the first began to be spoken by the Lord, and was confirmed to us by those who heard Him, NKJV
Can we neglect our salvation according to verse 3 above? Why do so many preach the opposite? They can no longer see the verses that they willingly speak against (1 Timothy 6:20-21), and you will be the same if you, now after knowing the truth, reject the truth in order to fit in with the blind.
42 Nevertheless even among the rulers many believed in Him, but because of the Pharisees they did not confess Him, lest they should be put out of the synagogue; 43 for they loved the praise of men more than the praise of God. NKJV
Hebrews chapter 2 sets the stage for Hebrews chapter 6. Yes, he is talking to Christians, who should already know and be practicing the elementary things, such as repentance from dead works, faith, the doctrine of baptism (covered in Romans ch 6), eternal judgment, and the like. Yes, this can happen, and is happening to Christians today.
1 Therefore, leaving the discussion of the elementary principles of Christ, let us go on to perfection, not laying again the foundation of repentance from dead works and of faith toward God, 2 of the doctrine of baptisms, of laying on of hands, of resurrection of the dead, and of eternal judgment. 3 And this we will do if God permits.
4 For it is impossible for those who were once enlightened, and have tasted the heavenly gift, and have become partakers of the Holy Spirit, 5 and have tasted the good word of God and the powers of the age to come, 6 if they fall away, to renew them again to repentance, since they crucify again for themselves the Son of God, and put Him to an open shame.
7 For the earth which drinks in the rain that often comes upon it, and bears herbs useful for those by whom it is cultivated, receives blessing from God; 8 but if it bears thorns and briers, it is rejected and near to being cursed, whose end is to be burned. NKJV
Think about this. If we lived by faith in accordance with Romans 10:6-8, we would never allow our heart to speak against Hebrews 2:1-3 above, in order that we could be righteous by faith, as it is promised, and gain control over our bodies (James 3:2).
6 But the righteousness of faith speaks in this way, “Do not say in your heart, ‘Who will ascend into heaven?'” (that is, to bring Christ down from above) 7 or, “‘Who will descend into the abyss?'” (that is, to bring Christ up from the dead). 8 But what does it say? “The word is near you, in your mouth and in your heart” (that is, the word of faith which we preach): NKJV
2 For we all stumble in many things. If anyone does not stumble in word, he is a perfect man, able also to bridle the whole body. NKJV
Knowing these things, and putting them into practice, will not only enable us to control our bodies (self-control), but they will also identity for us, “who does not have self control, and who is false” by their fruits (Matthew 7:15-20, 12:33-37).
Therefore, I will never say that a Christian cannot “neglect” (throw away, disregard) their salvation, and they do that by “not” paying close attention to the Word, and thereby drifting away (Hebrews 2:1-3). You can be sure that those who preach against those verses are not being led to preach by the Holy Spirit. By their fruits you will recognize them.
So, to answer your question concerning Hebrews 6, yes I believe it is possible, and very probable that most Christians today will lose their salvation, because according to Jesus Christ, most will take the broad path (Matthew 7:13-14). As it is written below, they seek to enter, but they will not be able. They call Jesus Lord, “Lord, Lord, did we not do this or that in Your name,” but they ignored even the elementary instructions.
23 Then one said to Him, “Lord, are there few who are saved?” And He said to them, 24 “Strive to enter through the narrow gate, for many, I say to you, will seek to enter and will not be able. 25 When once the Master of the house has risen up and shut the door, and you begin to stand outside and knock at the door, saying,’Lord, Lord, open for us,’ and He will answer and say to you,’I do not know you, where you are from,’ 26 then you will begin to say, ‘We ate and drank in Your presence, and You taught in our streets.’ 27 But He will say, ‘I tell you I do not know you, where you are from. Depart from Me, all you workers of iniquity.’ 28 There will be weeping and gnashing of teeth, when you see Abraham and Isaac and Jacob and all the prophets in the kingdom of God, and yourselves thrust out. NKJV
As evidence of this, I don’t believe that there is even one church left in this country that preaches the doctrine of abiding in Jesus Christ according to John 15:1-6, and there are forty other passages of scripture that we have rejected, if not more. I’m not just talking about some little hole in the wall church, but every mainstream denomination in this country, preaches in direct opposition of what Jesus Christ said in John 15:1-6, and forty other passages of scripture.
Therefore, it is very obvious to me that most church attending people today, have already rejected Jesus Christ, and refuse even to acknowledge His Word. Is it the Holy Spirit that makes us ignore John 15:1-6? They say “Jesus, Jesus, Jesus,” and they sing “Jesus, Jesus, Jesus,” but they reject His teachings, and have replaced it with the doctrines of men, just as the Pharisees did.
7 Hypocrites! Well did Isaiah prophesy about you, saying: 8 “These people draw near to Me with their mouth, And honor Me with their lips, But their heart is far from Me. 9 And in vain they worship Me, Teaching as doctrines the commandments of men.'”
10 When He had called the multitude to Himself, He said to them, “Hear and understand: 11 Not what goes into the mouth defiles a man; but what comes out of the mouth, this defiles a man.” 12 Then His disciples came and said to Him, “Do You know that the Pharisees were offended when they heard this saying?” 13 But He answered and said, “Every plant which My heavenly Father has not planted will be uprooted. 14 Let them alone. They are blind leaders of the blind. And if the blind leads the blind, both will fall into a ditch.” NKJV
Even when these things are mentioned to them, they refuse to repent, and return to the Word. So, yes I believe millions of Christians in this country are doomed to the fire of hell, or at best “outer darkness” (Matthew 8:12, 22:13, 25:30).
According to the Word of God, we are instructed, not to welcome anyone who does not bring the doctrine of abiding in Jesus Christ (2 John 1:9-11). Some of the newer Bibles have changed this to say “the teachings of Jesus,” but either way, is not John 15:1-6 a part of the teachings of Jesus?
2 John 9-11
9 Whoever transgresses and does not abide in the doctrine of Christ does not have God. He who abides in the doctrine of Christ has both the Father and the Son. 10 If anyone comes to you and does not bring this doctrine, do not receive him into your house nor greet him; 11 for he who greets him shares in his evil deeds. NKJV
So how can those, who reject the precepts, have a good understanding (Psalm 111:10)? They can’t, but they have millions of followers, who refuse to recognize them according to their fruits, but they honor them according to their worldly statue. In doing so, they also reject 2 Corinthians 5:16, and Philippians 3:3-4.
Now, about your second question concerning 1 Corinthians 5:5.