Claim: ‘Mark’ and ‘Luke’ were not even apostles or even eye-witnesses of Christ.

Proof: Easy. Check the list of Christ’s 12 apostles .... you will not find the names ‘Mark’ or ‘Luke’ among them.

Uh; you failed to show the EYEWITNESS part.

As I recall, Mark was a later scribe of Peter. We don’t know if Peter dictated Mark’s gospel, or if he wrote it from memory. I don’t think that he is thought to have been an eye-witness to the events he wrote about.

Where are you 'recalling' these facts from?

Acts 1:1-4 King James Version (KJV)

1 The former treatise have I made, O Theophilus, of all that Jesus began both to do and teach,

²Until the day in which he was taken up, after that he through the Holy Ghost had given commandments unto the apostles whom he had chosen:

³To whom also he shewed himself alive after his passion by many infallible proofs, being seen of them forty days, and speaking of the things pertaining to the kingdom of God:

⁴And, being assembled together with them, commanded them that they should not depart from Jerusalem, but wait for the promise of the Father, which, saith he, ye have heard of me.

And this is it:

Luke 1:1-4 King James Version (KJV)

1 Forasmuch as many have taken in hand to set forth in order a declaration of those things which are most surely believed among us,

²Even as they delivered them unto us, which from the beginning were eyewitnesses, and ministers of the word;

³It seemed good to me also, having had perfect understanding of all things from the very first, to write unto thee in order, most excellent Theophilus,

⁴That thou mightest know the certainty of those things, wherein thou hast been instructed.

This is all I am trying to do, most excellent teppe, Verse 4: That thou mightest know the certainty of those things, wherein thou hast been instructed.