Of course, you are right, but the focus of the subject matter here is Abrahamic religions and all Abrahamic religions are monotheistic in belief. Likewise, if the subject matter is chocolate, then, it’s 100 percent correct to say chocolate is confectionery, but, that would NOT be totally correct if the subject matter is confectionery.
You said:
‘Abrahamic religion’ simply mean religion that preaches the belief in only 1 God. So, on that basis, Judaism, Islam and Christianity falls under the ‘Abrahamic religion’ category.
This is an insufficient definition because to define "Abrahamic religion" by monotheism alone implies that all monotheistic religion is Abrahamic.
Monotheism is about the belief in only 1 God and other common characterics, it’s not about traditions and different schools of thought within a particular religion.
This is not hard to understand. Judaism, Christianity and Islam
are not the only religions which teach the belief in one sole divinity. Some schools within Hinduism (such as Krishnaism) teach that their deity is that one and only true God. If Abrahamic religion is defined by monotheism alone then the Hare Krishna people are as per your definition followers of an Abrahamic religion as they are monotheists. Clearly then, defining Abrahamic religion by its monotheism alone is insufficient.
What you fail to see is that Jesus himself is only familiar with the Pentateuch. Jesus himself has never heard of the New Testament or the term ‘Christian/Christianity’ in his entire life on earth. So, it’s only natural for the Qur’an to assume familiarity with the Pentateuch, just as Jesus would assume familiarity with the Pentateuch every time he made references to the Scripture – I can assure you Jesus certainly was NOT making references to the NT.
Jesus (as a man) would have been familiar with the entire Hebrew Bible, not just the Pentateuch. And while the New Testament did not exist in Jesus' own lifetime it is a far closer in time and thus more trustworthy account of who Jesus was and what he said then the claimed 'revelations' of a seventh century Arabian merchant turned warlord. Muhammad's Qur'an was centuries after the fact and the only evidence you have for the Qur'an's validity is
nothing but a mere claim of supernatural origin.
Islam simply means submission to the One and Only God and a Muslim is one who submits and does the Will of the One and Only God. Even Jesus’ main teaching is about submitting and doing the Will of the One and Only God. So, to say Islam assumes the Bible and are forced to reject the texts as corruptions is simply BS.
I am saying Islam as a concept makes no sense without a Biblical background.
Islam simply means submission to the One and Only God and a Muslim is one who submits and does the Will of the One and Only God. Even Jesus’ main teaching is about submitting and doing the Will of the One and Only God. So, to say Islam assumes the Bible and are forced to reject the texts as corruptions is simply BS. Fact is your own scripture affirm the scribes have been corrupting the scripture and turning it into a book of lies, and this happens as early as in the times of Jeremiah! So, it makes a lot of sense that the Bible you have today is a mixture of truth and lies. It’s sad that Christians today primarily listen and follow the words and preaching of other people rather than the words of Jesus as recorded in their own Bible.
Have you considered the possibility that Christians and Jews reject Islam not out of a denial of its "obvious" truth but rather because they don't think Muhammad's claims of divine revelation are true. The Bible even warns us of false prophets that will arise after Jesus' time. After all, Muhammad turned out to be far from the last to make claims of divine revelation. And you reject them all for much the same reasons I reject Muhammad.