Tom and Joe were partners in a business. When it came to disbursement of profits a small dispute arose between them so they decided to go to a third party to arbitrate between them. Joe was not familiar with the arbitration process; to him all arbitrators were the same. But Tom insisted on going to a specific arbitrator. Joe had no preferences so he submitted to the terms of the arbitrator that Tom chose.
After hearing both sides of the argument and examining the pertinent details of the case, the arbitrator ruled in favor of Joe.
Imagine if Tom were now to argue that this particular arbitrator is incapable of rendering fair judgment in their case and that they should have used a more competent arbitrator. Joe will surely respond by pointing out that it was Tom who insisted on using this particular arbitrator and that it was he who effectively empowered this arbitrator to resolve their dispute. By appealing to this arbitrator; Tom has implicitly validated the competence and the authority of this arbitrator.
Christianity insists that you should accept the claims of Jesus because he allegedly fulfilled certain prophecies in the Jewish Bible. By presenting their claim in this format, Christianity has submitted itself to a particular system of arbitration and it has acknowledged the legitimacy of that particular system to judge her case.
By telling you to accept Jesus on the basis of his alleged fulfillment of prophecy Christianity has admitted that the Jewish Bible is an authoritative book, it has acknowledged that you are capable of reading and understanding that book and it has acknowledged that you are perfectly capable of making decisions with cosmic ramifications on the basis of your understanding of the book. By claiming that its validity rests on the fulfillment of prophecy Christianity has empowered you to arbitrate and to render judgment concerning her validity or lack thereof.
If you read the Jewish Scriptures honestly and innocently and you conclude that the doctrines of Christianity are not supported by this text then it is your solemn responsibility to reject those doctrines as false. If the Church has a problem with your decision it cannot invalidate you as an arbitrator in this case. It was the Church itself who sanctioned this system of arbitration.