In the name of Allah, the Entirely Merciful, the Especially Merciful
Muslims believe in and accept all of the scriptures revealed to the Prophets by Allah:
The Scrolls of Ibrahim (Abraham), revealed to the Prophet Abraham
The Book of Psalms, revealed to the Prophet Dawood (David)
The Taurat (The Torah), revealed to the Prophet Musa (Moses)
The Injeel (The Gospel), revealed to the Prophet ‘Isa (Jesus)
The Qur’an, revealed to the Prophet Muhammad
May Allah’s peace and blessings be upon all of His Prophets
This may surprise you to find out that we Muslims believe in and accept all of the other Holy Books. We also believe in all of the Prophets, from Adam to Noah to Moses to Jesus to Muhammad, and all of the Prophets in between, and even the Prophets that we don’t know the names of that were sent to various nations around the world (may Allah’s peace and blessings be upon all of His Prophets).
However, with the exception of the Qur’an, all of these scriptures have either been lost entirely or corrupted by the hand of man over time, and as such they are no longer reliable. We believe in the scriptures as they were originally revealed to the Prophets. The Torah and the Gospel have now been combined into the Bible (the Old Testament and the New Testament), however it is widely known that the Bible has gone through quite a number of changes. For example, just look at how many different versions of the Bible there are. Certain verses have been added, removed, changed, etc. This is widely known and can be confirmed with a simple Google search, and it is something that Christian scholars are well aware of. But how can the Word of God be changed by man?
There exist different translations of the Qur’an as well, in English and many other languages. As is to be expected when translating across different languages, sometimes it’s difficult to properly capture the meaning intended in the original language. However, the difference with the Qur’an is that we still have the original source material, in the language that it was revealed in, Arabic, which is still a living language (meaning that people still actively speak it, as opposed to a dead language such as Latin). The Qur’an itself has not been changed by so much as a single letter since its revelation. There have been additions of punctuation and vowel markings, in order to make it easier for non-Arabic speakers to learn the Qur’an, but the actual words themselves have not been changed in the slightest.
The Qur’an also acknowledges the revelations that came before it. In fact, there is an entire chapter dedicated to Mary (called Maryam in Arabic) and the Prophet Jesus (peace be upon him). However, the Qur’an is an abrogation (update or replacement) to the scriptures that were revealed before it.
So, while we Muslims believe in accept all of Allah’s Books and Prophets, we follow the Qur’an because it is the final “updated”revelation from Allah, and the Prophet Muhammad (peace be upon him) is the final Prophet and Messenger sent to mankind by Allah.