What is the Word of God? The Bible or the Quran?

Both! Both the Bible (Old Testament and New Testament) and the Quran. We can deduce this very easily through logic:

First, let us emphasize that the God in all Abrahamic religions is one and the same God.
Therefore, Jews, Christians, and Muslims all believe in the same God, whose name is Yahweh. Muslims call Him Allah, which means God in Arabic. Most people operate under the false assumption that Muslims believe in some other God, which is not true. We see in the Quran that the heritage given from Abraham down to Moses is mentioned, so we know with certainty that the same God is in question.

Now, let us logically prove that thesis:

Would an almighty God allow no one but the Israelites to hear of His word?
We know based on the Bible and the Quran that non-Jews do not go to hell if they live a moral life based on the morality implanted into their souls at birth.
Satan cannot predict the future, but over time he gains greater and greater experience and wisdom, and changes his deception tactics.
Out of pure logic, a being that has been observing human psychology, weaknesses, and the rise and fall of empires for thousands of years understands the human mind incomparably better today than at the beginning of history. Over time, Satan has learned:
- Which biological and emotional triggers people find hardest to control (greed, ego, fear of poverty).
- How to avoid offering sin directly, packaging it instead in the form of virtue, progress, or freedom.

This means that Satan does not come with an obvious message of “do evil,” but instead whispers to modern man: “This is smart, everyone is doing this, this is your right, you have to look out for yourself.” Temptation has become so subtle that people often think they are following their own progress, while they are actually falling into the trap of alienation.
Consequently, we can conclude that it was significantly easier for ancient non-Jews to distinguish between good and evil. Over time, this became harder and harder.
In ancient times, temptations were often obvious and “crude” (e.g., bowing down to a physical idol made of stone).
Today, in the modern world, idols are not made of stone; instead, they have become abstract systems - materialism, the race for status, dependence on technology, and the constant distraction of the mind.
When we take all of this into account, as time went on, God wanted to make it easier for people to make decisions (as Satan became increasingly cunning and deceived people more easily), and so He spread the concept of the Jewish faith to a huge part of the world with the help of the apostles, who acted as missionaries.
But the apostles did not have as much success in the rest of the Middle East (the interior of the Arabian Peninsula, parts of Persia), so God chose the last messenger to complete that mission, and that is Muhammad.
Thus, the desired effect was achieved - even though Satan was becoming more manipulative and could more easily deceive people with a good soul and honest disposition who hadn’t heard of the Jewish faith - the word of God reached them (whether through the Bible, the Quran, or even just the Tanakh - as was the case with the Khazars).
God ensured that throughout human history everyone has an equal choice: to choose between the morality and rules established by the one God, or to accept the path of self-destruction and ruin laid out by Satan.

Many religious institutions criticize ecumenism and the unity of all monotheistic religions, primarily because they fear that when this happens, the Antichrist (referred to as “Dajjal” in the Hadiths) will take over and exploit that single world religion as a tool to rule the world.
However, we are not dealing here with religious institutions and their dogmas; we are dealing with the independent interpretation of the Bible and the Quran.
If, according to the Bible and the Quran, all people are equal and if the word of God is intended for every human being, we do not need the dogmas of religious institutions. These books were not written in academic Latin, but in simple Hebrew/Greek and Arabic, so that every person (even an ordinary shepherd) could understand them.
Of course, since the path to truth requires objectivity and logic, we will take all interpretations into account and separate those that are the most logical and in line with the Word of God, without contradicting the rest of the Bible and the Quran.

Does the Quran Contradict the Bible?