Your choice of course, but Gnosticism is a recognized heresy by any Christian source. And the church fathers you referenced are long passed. And those were the Words of God, not gnostics.
Generalizing can be a trap. I want to be specific. First, read 'The Nag Hammadi Library'. Compare that to the New Testament, especially the four Gospels. (Good luck reading the 'Library'; it is mind bending!)
For the spiritually believing Christian, Gnosticism is just too much of an intellectual pursuit. Book after book, chapter after chapter, Gnostic writing attempts to lay out a form of 'logical belief.' There are multiple laborious passages involving Archons (Greek: 'Principles'), layers of them, performing all sorts of tasks and operations to effect spiritual influences on earthly matters.
As intellectually interesting as that might be, it obscures one basic tenet of faith: belief by surrender. For example, the virgin birth - or resurrection from the dead; I 'surrender' my logical thought faculties to simply believe the Word; I don't need ranked legions of Archons performing their duties to achieve otherwise miraculous supernatural feats.
If the Gnostic books were interspersed within the NT cannon, the spiritual power of faith would become so diminished as to be lost.
The Jews also encountered Second Century and later Gnostic endeavors to define the OT. They also took a dim view of such efforts.
{I hope this is cogent; I am half asleep! 😒}