All perfect praise be to Allaah, The Lord of the Worlds. I testify that there is none worthy of worship except Allaah, and that Muhammad is His slave and Messenger. We ask Allaah to exalt his mention as well as that of his family and all his companions.
Yes, what the Shaykh mentioned to you is correct. Indeed some Jewish and Christian priests wrote a book which they entitled 'The True Criterion'. It has 366 medium-sized pages and it is published in both Arabic and English. It comprises, as they claim, 77 various chapters. The names of these false chapters are: The Injeel, the crucifixion, the trinity, the deviant and so forth. Each chapter starts with an opening that symbolizes the Christian belief: 'In the name of the father, the word, the spirit, the One and only true God. He is triune in unity, united in trinity, invisible as deity'.
The chapter 'The Messiah', which was written by their sinful hands, reads: 'And you claimed that some of the Injeel was falsified, and you have thrown all of it behind your backs.' By this, they deny why the Quran has clarified that the Injeel and the Torah have been falsified. They also accuse, in this false book, the Muslims of being hypocrites. The same fabricated chapter reads: 'But then you abrogated it (belief in Jesus) proclaiming whoever desires any other religion except ours it will not be accepted from him.' Such declarations emanate only from confirmed hypocrites. This is indeed the statement of the hypocrites.
The above fabricated book contains other statements of disbelief which contradict the Book of Allaah, the Sunnah of the Prophet and the religion of Islam.
Of course, the objective of their book is to mix the true belief of Islam which was revealed by Allaah with the false concepts and belief which was planned by the priests and monks in order to repel the Muslims from their religion.
Allaah Knows best.