I do believe there are several statements of Christ which you have said you don't trust as actually being said by Christ.
Isn't that true?
Neither you nor I have any way of knowing with absolute certainty that whichever verse you read in the Biblre wasn't added at a later date (as we know is the case with some verses), or that certain verses were not erased.
The fact that rabbis added vowels which can change menanings of words, and that modern versions of the Bible have commas placed where someone "believed" they should be (and in some cases these commas can change the whole meaning of the verse) is sufficient to cast doubt on the Bible as a pristine divine text.
Likewise the language itself an how it is understood or translated adds to this conclusion. St. Paul's famous verse that all men have sinned through Adam can be interpreted in two ways. The native Greek speakers interpret it one way and the non-native Greeks peakers the other way. The same thing can be said of the "virgin" vice a "young woman" in Isaiah.
The burden of proof is not in doubting but in providing facts that dispell any reasonable doubt.