I only brought this up, because I thought in your previous post, you were down playing just how perfect and vital the Tanakh is by saying it is used to point to Jesus. The whole world exists on the words of the Tanakh, that is why not even a dot can be erased nor will it until heaven and earth pass away (which is never). Jesus himself is the Word of G-d, therefore he himself is a walking Torah Scroll.
As for the Siddur, you don't trust Ezra or Nechimah? One of them alone would make the wisest man in the last 1000 years look like a child in wisdom, I can assure you "they checked the scripture". They knew 70+ languages and all the sciences the world had to offer as well in order to be the leaders they were (i.e. the Sanhedrin Leaders) at that time.