99%? How do you know this? Oh, the manuscript we have, blah blah blah. The manuscripts we have are copies of the original, not the originals themselves. Many of them differ one from another. Which one has what the originals had? Nobody knows. People guess, they theorize, they work off of assumptions and man-made principles, but nobody knows for sure what the originals said. That 99% you gave is a bunch of bologna. You have no way of testing that and proving it true.
How can I take the scriptures as authoritative? By faith. That's the only way. The manuscript route using textual criticism fails every time. It's failure is in the fact that no original copy exists and we have no eyewitness of those copies. It is trying to bring the bible as close to something that the practitioners of this process have never seen. How can you know whether 1 John 5:7 is original or not? What about the disputed portions of John 8 and Mark 16? Textual criticism hasn't answered these questions.
Do any of the disputed texts effect the rest of the Word that we do know? You are suggesting that they do. I (and textual scholars) are saying that they do not.
I'd humbly offer that the millions upon millions of people in the world who have had a life-changing experience with Jesus Christ based on the hearing of the Word -- in whichever fashion they heard it (Latin, Greek, Hebrew, Coptic, Syriac, English, German, French, etc., etc., etc.) -- have been saved in exactly the biblical fashion, by belief upon hearing of the Word.
In part, what I think that you are suggesting is that the game of "telephone" was played with the Scriptures (where one person whispers into another's ear, and the message is passed along -- changing wildly by the end person in a group), but that is not how the texts were passed on. They were written, cherished, copied, and distributed widely. They were cited, prayed, included in the worship services, inscribed on tombs, etc. When ALL these sources are compared, we end up not with a game of "telephone" but rather a science of comparison of texts to derive textual families, and textual transmission.
Above, I asked if you had any ability to work in the original languages. I see that you failed to respond to that question, which implies that you do not. I must then presume that you are getting your knowledge about the Word from some other source than your own informed study -- perhaps Bart Ehrman, who was once a decent textual scholar, but who lost faith and turned from the Word to his own reason and insight. I feel for him and those whom he has led astray, perhaps even you...
Finally, and again, if you cannot accept the veracity of the texts we have, then you need to turn your back on Christianity, for you are basing your belief in something other than the Word of God handed down through the ages. Is that the case? Or, can you trust the work done by scholars who have dedicated their lives to the study and accurate transmission of the Word of God down through the ages, knowing that God will and has preserved His Word, just as He said He would?