I read your post again to improve my intelligence.
"In simple form, these teachings include the Unity of God; unity in the teachings of all the Books and Prophets of God; unity between the Word of God and the Work of God in the Signs and science of Nature and in the history of religion; unity between the Word of God and the sayings and doings of the Prophets; unity between the world of God and the world of Caesar; and so on."
The unity in teachings is clearly a fact. What is incorrect is to assume that every word of the Bible is true, we must use the Qur'an to judge what is right and what has been interpolated by other men.
In the Bible we have god telling Abraham to circumcise, if we accept this as true then it must become a Creed of Abraham. You have stated in another post that the Qur'an does not prohibit or allow this, so it is not against the Qur'an to do it, but it is not like a beard, personal choice, it is now a religious obligation, a sunnah, from hadith that it must be done. Religious duties must only come from the Qur'an, anywhere else is shirk, so I reject these hadith. What you are doing is taking it back further in history and calling it a Creed of Abraham and as the Qur'an says we must do as Abraham did, then circumcision becomes a creed and obligatory, no choice. I reject this.
I am only using circumcision as an example but it is applicable to all things that have been added to our Deen like ritual namaaz, hajj rituals, fasting rituals etc. It is a way of continuing with falsehood by attribiuting them to the Creed or "if it is not prohibited in the Qur'an, it is OK"
All the Creeds of Abraham we are supposed to follow are in the Qur'an and anything else is man made innovation.
As for your quote • Sometimes some of the observations of Nature, such as Evolution, constitute an illusion. The Qur’an argues against this in every detail.
This is your personal opinion based upon a misunderstanding of the Qur'an or not reading verses without preconceived ideas. Why would Allah give us an illusion when He said look for His signs? Most unusual for Allah to trick us in this way!