The Book, the Qur'an, is without a doubt revealed from Allah.
I don't think either of your interpretations are correct. The statement is not talking about the book's origins, which are in the past. This statement uses "is", not "was". It is making a statement of religious belief that Allah reveals the Qur'an, and that the writer does not doubt this.
As I understand it, adherents to Islam believe that the Qur'an was given orally to the prophet Muhammad by Allah and then it was written by his companions, not Allah himself. So, regarding the structure of your sentence, consider this similar statement:
The Book, the Qur'an, was without a doubt written down by companions of the prophet Muhammad.
The structure is much the same but I don't believe one could read this any other way than stating who wrote down the words of the Qur'an. I think this illustrates that your original sentence is making one single statement, not two, but the writer is emphasising his certainty of it.
As to the meaning, I believe the confusion may come from the fact that the words "revealed from" are a little ambiguous unless one is familiar with the religious terminology. I am not a Muslim and so cannot give a deep insight into what "revealed" means in this context, but I understand it to mean the belief that Allah allows people to fully grasp the words of the Qur'an. This is something that believers may state happens on an ongoing basis, not in the past, which is why I say neither of your interpretations are correct because you understood it to be where the book comes from.