Actually I am defending my FAITH in this issue that we have God's words 100% accurately
And if that's your faith, then your faith is in an extrabiblical statement, not a statement of scripture.
that I must accept Textual criticism above that of FAITH
Absolutely noone says you have to accept textual criticism above faith, just that true faith doesn't assert as dogma something not found in scripture. No one (at least here, where we all ought to have a high view of scripture) asserts the findings of textual criticism as dogma. They may use the finding of textual criticism as evidence for their opinions about things, but they don't assert it as dogma. Its not a RULE. There is a difference between something being possibly (or even probably) true, and it being a RULE.
So you are willing to accept extrabiblical teachings
No, as I just explained above, I don't accept them as a rule of my faith and practice. I may hold them as probably true in my opinion, but I hold them with light fingers, and I would never insist that anyone else cowtow to extrabiblical opinion.
believe that to be authoritative
No, nothing extrabiblical is authoritative. Nothing extrabiblical can ever go in my absolutely correct statement of doctrine.
So, to give an example of what I mean:
Scripture tells us something about the process of the divine inspiration of what the original authors wrote. It tells us that they spoke as they were moved by the Spirit. It tells us that they were given to us by God exhaling the writings.
It is perfectly legitimate, then, for me to put in my doctrinal statement that the original documents of scripture were without error, because that assertion follows directly from what scripture clearly states to us. I can make it a rule of faith.
But since scripture tells us nothing about the process of preservation--it never tells us that the translations of the any particular version, or even translations in general were exhaled by God--I can't dogmatically speak to that. I can say, "That's the way I think it must be" or "That's what makes sense to me at this point", but I can't make it a rule of faith, because at it's core, it's an extrabiblical theory. It may be a true theory, it may be an educated theory, it may be a common sense theory, but I can't assert it as absolute doctrine without a plain statement from God in his word that it is so.
I happen to think that a certain sort of text is probably closer to what was originally God-breathed than another sort of text. But it remains simply my opinion. I think it's a reasonable opinion; I even think its an opinion that the Holy Spirit guided me to, but I still won't state it dogmatically. I won't insist that all who are truly listening to the Spirit need to agree with me, and I won't make it a rule of faith, because it's EXTRABIBLICAL. The evidence for it comes from things outside the Bible, because it's simply an issue the Bible doesn't speak to. And since the Bible doesn't speak to it, I won't speak dogmatically on it. It would be wrong of me to do so.
That's what the reformers meant by "sola scriptura". The Roman church asserted as dogma all sorts of extrabiblical things because they made things other than scripture the rule of faith. If we aren't careful to keep on adhering to sola scriptura, we'll find ourselves needing another reformation.