You asked about Joh 11:26:

Joh 11:26 And whosoever liveth and believeth in me shall never die. Believest thou this?

The reason this verse is hard to understand is that the whole orthodox Christian world cannot see that:

Joh 6:63 I t is the spirit that quickeneth [ gives life]; the flesh profiteth nothing: the words that I speak unto you, they are spirit, and they are life.

The whole orthodox Christian world believes that we will be given spiritual bodies of flesh and bone. This, of course, is an oxymoron. Here is the Truth from the mouth of the Truth:

Joh 3:6 That which is born of the flesh is flesh; and that which is born of the Spirit is spirit.
Joh 3:7 Marvel not that I said unto thee, Ye must be born again.
Joh 3:8 The wind bloweth where it listeth, and thou hearest the sound thereof, but canst not tell whence it cometh, and whither it goeth: so is every one that is born of the Spirit.

The flesh recoils at such unfleshly words and twist the words of scripture to mix flesh and spirit and come up with and eternal glorified spiritual body that can be seen and touched. And as the doctrine goes, since Christ ate and drank with the disciple after the resurrection, we will still be able to enjoy a good steak. How childish and carnal. Such a doctrine pits Christ’s words to Nicodemus in Joh 3 against Christ’s words elsewhere. But there is no contradiction except in the minds of the carnal. The fact that spirit can be manifest as flesh does not make it flesh. Did the Lord and the two angels that ate the fatted calf and the bread with Abraham really need that? Was that not for Abraham’s benefit? Did Christ really need the “piece of a fish and a honey comb, to quench His hunger? Or was He not also eating simply to make the point: ” These [ the piece of fish and of an honeycomb] are the words which I spake unto you, while I was yet with you, that all things must be fulfilled, which were written in the law of Moses, and in the prophets, and in the psalms, concerning me.”

Luk 24:41 And while they yet believed not for joy, and wondered, he said unto them, Have ye here any meat?
Luk 24:42 And they gave him a piece of a broiled fish, and of an honeycomb.
Luk 24:43 And he took it, and did eat before them.
Luk 24:44 And he said unto them, These are the words which I spake unto you, while I was yet with you, that all things must be fulfilled, which were written in the law of Moses, and in the prophets, and in the psalms, concerning me.
Luk 24:45 Then opened he their understanding, that they might understand the scriptures,

Read the paper on Rightly Dividing The Word. That paper demonstrates that most of the scriptures quoted in the New Testament are what the Dallas Theological Seminary and all other seminaries, would say were taken out of context.

That was the direct result of “Then opened he their understanding, that they might understand the scriptures.” When Christ raised Lazarus from the dead, He did not give Lazarus life, any more than you and I were alive at our birth. Lazarus was put right back into the same old body he was born into. Christ told one disciples: Let the [ spiritually] dead bury their [ physically and spiritually] dead.”

Mat 8:21 And another of his disciples said unto him, Lord, suffer me first to go and bury my father.
Mat 8:22 But Jesus said unto him, Follow me; and let the dead bury their dead.

Here is Paul’s perspective on this “living soul,” physical existence we have “in Adam:”

Rom 7:24 O wretched man that I am! who shall deliver me from the body of this death?

Paul, obviously understood what Christ meant when He said:

Joh 6:63 It is the spirit that quickeneth; the flesh [ being ‘in Adam’] profiteth nothing: the words that I speak unto you, they are spirit, and they are life.

I doubt seriously that Mary had any idea what Christ meant by his question:

Joh 11:26 And whosoever liveth and believeth in me shall never die. Believest thou this?

No one was even converted yet. Here understanding of scripture had not yet been given. But it certainly had been given to the writer of Hebrews. and when he, made this statement:

Heb 9:27 And as it is appointed unto men once to die, but after this the judgment:
Heb 9:28 So Christ was once offered to bear the sins of many; and unto them that look for him shall he appear the second time without sin unto salvation.

Paul knew that Christ’s “body of this death,” could no more, ” inherit the kingdom of heaven,” than could ours. “The flesh [ even of Christ] profits nothing.” Physical death is not the subject of Heb 9:27! We, in Adam, are appointed to spiritual death. Until we see this we cannot be judged. And since:

1Pe 4:17 … The time is come that judgment must begin at the house of God: and if it first begin at us, what shall the end be of them that obey not the gospel of God?

It is imperative that we understand what Christ meant when he asked Mary:

Joh 11:26 And whosoever liveth and believeth in me shall never die. Believest thou this?

This was a spiritual statement which Christ was making by asked Mary, not so much for her benefit as for ours.

Joh 11:41 Then they took away the stone from the place where the dead was laid. And Jesus lifted up his eyes, and said, Father, I thank thee that thou hast heard me.
Joh 11:42 And I knew that thou hearest me always: but because of the people which stand by I said it, that they may believe that thou hast sent me.

I hope you now have a better understanding of what Jesus was doing in asking Mary that question. He certainly was not speaking of physical death or physical life. Neither is Heb 9:27.