Jesus DID promise the Holy Spirit to guide his church in all truths. What I think you are incorrect about - and which I can understand that you are because of whom you allow to tell you what you should believe - it that the CHURCH is us. The body of Christ is the universal, spiritual, called-out assembly of all believers in him from all time. It isn't, like you seem to favor, comprised wholly and completely with the organization which calls itself the Roman Catholic Church. I know that this is hard to hear, but when Jesus prayed for this body, this church, that we would all be one as he and the Father are one, I am positively sure his prayers were answered in the affirmative. He always does the Father's will so anything he prayed was in the Father's will. Git it? I think getting over this hurdle in thinking may do wonders to your whole grasp of the things of God. Not only for how he deals with Israel. Try it.
what you don’t understand is the Church is visible, and One. you also don’t understand Jesus gave this Church authority to teach, and promised the Holy Spirit to lead it to all truth. this truth is the same in the 1st century, 2nd century, 3rd century and so on.... and yes, Jesus was heard in John 17 and the true Church is One. The true Church has been here for 2,000 years, if you believe the Catholic Faith you are part of this Body. If you reject the Catholic Faith, but claim faith in “Jesus”, are you believing a false Jesus or the true one? It seems to me, Jesus is One, there is One Faith and One Baptism. I don’t have the authority to start a new church, and neither does anyone else. how are you sure Jesus’s prayer was answered, when you withhold fellowship from His Church? doesn’t it bother you, that you have to wait until the 16th century when you can find people who you can worship with? i want to follow Jesus and that means being in His Body and following doctrines handed down from the Apostles. i can find the Church in all 2,000 years, can you?