I suppose this depends both on what one believes constitutes “consideration” and what one considers a Gnostic text. Certainly lots of early Christians used texts that today would be considered to be in error in various ways, including texts considered Gnostic.
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Not really. There was never the smallest shred of evidence any Gnostic text was up for consideration for the canon. Period. Come on, this is undeniable. Look at the lists. Read the second century theologians. You can’t name one who didn’t argue straight down the line for orthodox Christianity. Look at how they regarded Gnostic texts.
The sole instance we have of any Christian promoting a Gnostic text, other than to condemn it, was one reading of Peter. And what happened? Bishop Serapion promptly stomped down on that heresy. And of course we don’t even know if that Gospel of Peter had anything to do with the text we have from the - what was it? 9th century or so? - but even if it was the same, Peter is mostly a pious text, only touched by a bit of Docetism perhaps.
And here is where I feel you veer suddenly into confusion with “lots of texts” you point out “in error”. Now, let us think about that. Is that really true? Sorry, I must disagree. Orthodoxy was a passionate concern of the church from the first day. Look, look at all the earliest texts. Does one or two fall into an error? Of course. But these would be argued over, corrected, and, if found not to be completely orthodox, tossed out. Hello, Origen.
Paul was outraged by any lapse from orthodoxy, So also in 95 AD 1 Clement and then in 110 AD in the letters of Ignatius we see bishops insisting on orthodoxy. Marcion tried to gift the church in Rome with a sum quite utterly fabulous, which was rejected because: lack of orthodoxy.
There simply is no way that I can see to argue that there was a happy confusion over beliefs, or large. numbers of people who didn’t know there was any difference between a Gnostic text raving on about the Demiurge and aeons, and the Gospel of Matthew/.