Summary:

• In the time of Muhammad and long before him, people — including ancient scientists like Aristotle — commonly believed that the heart, not the brain, was responsible for thinking, understanding, reasoning, beliefs, and faith.
• There is no All-Knowing Allah in the heavens. Muhammad was inventing the religion and attributing it to Allah and revelation. Being a 7th-century human, he repeated the common scientific error of his time in the Quran and Hadith.
• Modern science conclusively proved in the 16th century (and beyond) that it is the brain, not the heart, that is responsible for thinking, reasoning, memory, and understanding.
• For Muslims, accepting this scientific fact became impossible because the Quran and Hadith clearly state — in a literal sense — that the heart is the center of thinking and faith.
• Therefore, 21st-century Muslim preachers resorted to extreme deception. They twisted scientific facts and falsely claimed that the Quran’s statements about the heart are a “scientific miracle.”
• What was once a clear scientific error in the Quran has now been marketed as a miracle by these preachers.

However, such deceptions cannot hide the truth forever:

• Scientists have successfully created artificial hearts. People with artificial hearts continue to think, reason, believe, and function normally — with zero change in their intelligence or faith.
• People have also survived with genetically modified pig hearts for months. According to the new “miracle” narrative, the center of Imaan (faith) has now become a pig’s heart.

Detailed Answer

Muhammad simply copied this widespread ancient mistake. Ancient Egyptians, Mesopotamians, and even Aristotle believed the heart was the seat of thought, wisdom, emotions, and the soul. The brain was often considered insignificant — in Egyptian mummification, the brain was discarded while the heart was preserved.

It was only in the 16th century that the nervous system was properly understood, and in the last 100 years that neuroscience firmly established the brain as the center of cognition.

Quranic Verses that clearly attribute thinking to the heart:

Quran 7:179:

“And We have certainly created for Hell many of the jinn and mankind. They have hearts with which they do not understand, they have eyes with which they do not see, and they have ears with which they do not hear.”

Quran 22:46:

“Have they not traveled through the land and observed how was the end of those before them? They had greater power than them, and they dug the earth and built it more than these have built. And their messengers came to them with clear evidences. And Allah would never have wronged them, but they were wronging themselves. It was not the eyes that were blinded, but blinded were the hearts within the breasts.”

Quran 63:3:

“That is because they believed, then disbelieved, therefore their hearts are sealed so that they understand not.”

Hadith References (Literal, not metaphorical):

Sahih Bukhari 52:

“Beware! There is a piece of flesh in the body — if it becomes good (reformed), the whole body becomes good, but if it gets spoilt, the whole body gets spoilt — and that is the heart.”

Sunan Tirmidhi 3346:

The Prophet ﷺ said that his chest was split open, his heart was removed and washed with Zamzam water, then returned, and he was filled with faith and wisdom.

Sunan Ibn Majah 4244 (Sahih):

“When the believer commits a sin, a black spot appears on his heart…”

Musnad Ahmad 12381:

The Prophet ﷺ said: “Islam is outward, and faith (Imaan) is in the heart,” and he pointed to his chest three times.

Muslim Preachers’ Desperate Deception

Modern preachers like Zakir Naik claim the Quran is miraculously correct because the heart has neurons and communicates with the brain. They twist small studies on “heart-brain connection” while ignoring that:

• People with artificial hearts think and reason normally.
• People with pig hearts think and reason normally.
• The brain remains the primary organ for cognition, decision-making, and understanding.

Even the so-called “cellular memory” studies they quote are extremely small, non-replicated, and show only minor behavioral changes — not that the heart controls thinking or seals understanding.

Final Questions for Muslims

• If a Muslim receives a non-Muslim’s heart, does he become a Kafir?
• If a Muslim receives a pig’s heart, does the center of his Imaan (faith) now become a pig’s heart?
• Does the Quran speak the language of 7th-century ignorance or the language of the All-Knowing Creator of the Universe?

Conclusion:

The Quran and Hadith clearly reflect the common scientific mistake of 7th-century Arabia — that the heart is the center of thinking and faith. Modern science has proven this wrong beyond any doubt. Instead of accepting this clear error, Muslim preachers have turned it into a so-called “miracle” through deception and selective science.

This is not the speech of an All-Knowing God. It is the speech of a 7th-century man who was repeating the knowledge — and mistakes — of his time.