You should read the Gnostic Gospels found in
Nag Hammadi, of Mary and Thomas. and others
I own the entire Nag Hammadi library that comes with the Gospels of Judas and Mary as well as the entire corpus of the Nag Hammadi codices, more material than just Gospels, I also own G.R.S. Meade's translation of Pistis-Sophia and I have read all of them and it.
So I have checked out the "Gnostic Gospels" and they DO NOT support your claim and just plain don't say that Mary is an Apostle or the Apostle to the Apostles, she has a prominent position but not as much as you think. I say think because clearly you have not read the Nag Hammadi library and maybe have read Gospel of Thomas but I doubt it because it has James the Just as head of the Apostles and as "the reason Heaven and earth came into being."
Mary is not that prominent in Thomas, a sayings Gospel of 114 sayings, some Canonical some not, and little story telling or character interaction. It definitely doesn't call Mary "Apostle" in any way. So you should not be using it as evidence of support your made up assertion that Mary Magdalene was Apostle to the Apostles, modified later to a Gnostic belief, because they didn't say that either (Apostle to the Apostles).
Which is the matter of debate, you claiming that she was called that and having no proof, trying to get away with it by saying the Gnostic Gospels say it when they don't.
You have no credibility now.
They did.... and they do now, call her Apostle to the Apostles as does the Pope.
I find it sad that some people Believe that every thing that is to be found is in the Bible. that is a very protestant attitude.
Mary Magdalene – 'Apostle to the Apostles' – gets upgraded feast day
The Pope calling her that is irrelevant to the facts, if true it his personal title, not from any legitimate source, which means the Bible.
It is not even a tradition of the Church Fathers or the Apocrypha, not a tradition at all really, just what a man said 2,000 years after the events.
What is sad is people MAKING UP traditions with NO SOURCE from antiquity, Apocryphal, pseudepigraphal, Gnostic or historical, theological writing, NOTHING but their imagination.
I read the crap out of non Canonical Apocrypha, Pseudepigrapha and so called "Gnostic" (Sethian Christian) scripture and can tell you don't, so it's sad you think what you do yourself (not read extra Canonical writings) is sad but don't do anything to change it and just invent your own traditions instead.
There is 4 times as much (at least) Apocrypha of the New Testament era alone than is actually IN the New Testament.
None of it says what you are claiming about Mary Magdalene though, which is how I know you don't read Apocrypha or Church Fathers writings, because nobody supports the claim you are making and you would not make it if you honestly read the stuff you say is sad nobody does.