@SpartenOmega117 I think you have a very simplistic and optimistic look. You lack information. You need to read more, much more from different perspectives to have a clear look.
Yes, judaism, christianity and islam are related religions. Both christianity and islam in the early years of their formation were viewed as a sect of the previous and not as a new religions and most probably their creators view them as continuation of the old ones. So yes - jews, christians and muslims beleave in the same GOD and share prophets, ideas and religios books from the monoistic religions before them, mixed with some local traditions. I see that you got that.
"Muslims believe in the Bible and the Torah. Yes, you might not believe it, but there are 4 holy books. Torah, Zabur, Bible, and Quran. We consider these the 4 holy books of islam."
From this sentance I can clearly view that you lack basic information about judaism and christianty and probably deep knowledge of islam. The Islamic holy books are - Tawrat (Torah), the Zabur (Psalms), the Injil (Gospel or New Testament), and the Qur'an. Bible contains the text of the Hebrew Bible, but arranged in a different order (Old Testament) and the Gospel (New Testament), so as you can see every new religion contains the local religios text of the previous ones, but only thouse that were created before the new one was formed, mixed with local pre-christina/islam traditions.
Now lets see what you didn't got right.
"The reason we don't believe in the current Bible is because Muslims beleive that the Bible has been changed quite a bit throughtout the years by the Pope, priests, etc. So we don't think it is original and has been changed dramatically. Otherwise we do believe in the Bible."
Both Gospel and Quran were not written by Jesus or Muhammad. They were collected and were standardised in today's version from many other writings and memories after Jesus and Muhammad were dead. According to the traditional muslim view initial revelations were memorize by Muhammad companions and later written on different sorts of parchments, tablets of stone, branches of date trees, other wood, leaves, leather and even bones. This items were scattered amongst many people as private possession. As time pass by many of the Muhammad companions who had memorised portions of the Qur'an were dying in battles or of old age. Consequently Zaid ibn Thabit, was assigned the duty of collecting all of the Qur'anic text by Abu Bakr. This was his reaction acording to hadith:
"...By Allah, if he (Abu Bakr) had ordered me to shift one of the mountains it would not have been harder for me than what he had ordered me concerning the collection of the Qur'an... So I started locating the Qur'anic material and collecting it from parchments, scapula, leafstalks of date palms and from the memories of men."
The compilation was kept by the Caliph Abu Bakr, after his death by his successor, Caliph Umar, who on his deathbed gave them to Hafsa bint Umar. By the time of the third caliph Uthman ibn Affan, Hudhayfah ibn al-Yaman, came to Uthman and urged him to save the Muslim ummah because differencies in various islamic centers became obvious. Based on Muslims sources, the differences were serious enough to cause muslims to be divided, as to cause one muslim group to call another group heretics.
"During the reign of Uthman, teachers were teaching this or that reading to their students. When the students met and disagreed about the reading, they reported the differences to their teachings. They would defend their readings, condemning the others as heretical."[Kitab al-Masahif]
Uthman obtained the manuscripts from Hafsah, then give a task to Zayd ibn Thabit to create a standart copy of Quran. When standard copies were made all other material was burnt.
According to Shia as well as some Sunni scholars Ali ibn Abu Talib compiled his own version of Quran right after the dead of Muhammad. When the volume was completed it was brought to Medina, where it was shown, but his version was rejected. Although his book differed from the Uthmanic codex, Ali accepted the standardized version.
There are some other variations of this story, such as that Uthman found that there are seven different qurans, and people are fighting because of that multitude of qurans, so he burned six of the seven qurans and preserved only one. Information from muslim sources about Mas’ud, who was asked to burn his version of the Qur’an.
"How can you order me to recite the reading of Zaid, when I recited from the very mouth of the Prophet some seventy Surahs?" "Am I, to abandon what I acquired from the very lips of the Prophet?"[Kitab al-Masahif]
Some western historians dispute the official view and think that is no early then 9 century that the final version of Quran was made, but I think you got the idea - the Quran was formed as you know it today after the dead of Muhammad by compilation of various collected scripts and memories as a political desition to keep the faith from branching. After the compilation was over all others were destroied. Some hadith attest that some verses could not be found any more in the standart version. A contemporary essay from John of Damascus describes a surah called the "Camel of God" which is no longer extant.
The history of Christian Bible is similar to the Quran. The Bible was formed as we know it today after the dead of Jesus by compilation of various collected scripts of what Jesus had said and done, as reported by his Apostles and Disciples. At some point there was a need to make a standart collection of scripts as a political desition to keep the faith from branching, because differencies in various christian centers became obvious. Some christian churches add more scripts then other, but in almost all Christian traditions today, the New Testament consists of 27 books. The original texts were written beginning around A.D. 50 in Koine Greek, the lingua franca of the eastern part of the Roman Empire where they were composed. All of the works which would eventually be incorporated into the New Testament have been written no later than the mid-2nd century. Not all scripts were included - Gospel of Thomas for example. The Pope didn't wrote any gospels or change them. They can only add or remove from the collected old scripts.
This standartization of Bible and Quran doesn't keep Islam or Christianity from branching but at least form a single book for Islam and books with minor differences for Christianity.
