If it's not found in Scripture, it's veracity is up for grabs. It's going to take a lot more than the writings of anyone whose other works that happened long after the fact and are considered heretical.
Extra-Biblical writings just don't hold much merit if they don't have solid Scriptural support.
They may be interesting as casual reading as an intellectual exercise, but if they're not Scripture the Catholic church is in a pretty weak position to criticize and condemn someone for being skeptical of their truthfulness.
Lots of other denominations claim extra-Biblical revelation to support their doctrine and yet they are considered cults for that. I am unconvinced that the Catholic church is the exception.
It requires faith, -- but we also accept the scripture by faith. There is no shortage of sundry atheists who say that the veracity of the Holy Scripture is up for grabs. You either trust the Church's witness or you don't. Those who do are Catholics.
the Catholic church is in a pretty weak position to criticize and condemn someone for being skeptical of their truthfulness.
To criticize is logical, because by your scepsis your faith is defective and illogical. To condemn is indeed unfair, but I do not condemn anyone for lack of belief of any kind. You are not Catholic and you are free to believe whatever you want. Now, what is worthy of condemnation are the Protestant beliefs that contradict the scripture, and they happen to be your foundational beliefs in Sola Fide and Sola Scriptura. For those I do condemn you as heretics and people who place their souls in great peril by listening to the charlatans of the Reformation. You disbelief in the life of the Holy Mother of God as it is known to us is something I am ready to shrug off; I only argue on this because you choose to argue.