What is the situation today regarding the Christian sects and their Gospels and original copies? Do they rely on old versions like the Vatican, Sinaitic, and Alexandrian as authentic Gospels? And what was the situation of Christian sects at the time of the Prophet (peace be upon him)—did they rely on those old versions, or were there other Gospels that differed from them?

"Speaking about the different Christian denominations and comparing them to ancient sects and Gospels would require an independent book. There are specialized books and websites in this field, including: "Izhar al-Haqq" by Rahmatullah al-Hindi, "Judaism and Christianity" by Ahmed Shalaby, "Lectures on Christianity" by Muhammad Abu Zahra, "Pagan Beliefs in the Christian Religion" by Muhammad Tahir al-Tanir, books and lectures by Ahmed Deedat, "Al-Jawab al-Sahih li-man baddala Din al-Masih" by Ibn Taymiyyah, "Hidayat al-Hayara" by Ibn Qayyim al-Jawziyyah, and "Studies in Judaism, Christianity, and Indian Religions" by Muhammad Diya al-Rahman al-Azami.

One can also benefit from websites such as: Christianity from an Islamic Perspective, Guiding the Bewildered among Christians, and For Christians Only. In addition to the books by Sheikh Abd al-Rahman Abd al-Khaliq: "The Gospel's Testimony that Jesus is the Servant of Allah, His Messenger, and His Word which He bestowed upon Mary and a Spirit from Him" and "A Rebuttal to Tony Bolder and Jovak's Questions and Doubts about the Holy Quran and the Great Prophet." One can also refer to fatwas on the website with the following numbers: 31106, 33169, 34699, 33918."