Also, if anyone could explain the theory of similarity between Islam, Christianity and Judaism
Why do people write it down in the first place?
Why do people ever right "God"?
Mostly for lessons and prayers.
In hindsight, that sounds really obvious.
Islam has the same belief, except that not only words with god's name. Any book with any quote from the quran or hadith or any prayer shall be treated with the same amount of respect. One must also take the 'wuduk' which is a cleansing ritual before touching a 'quran'