Mohammed’s remains are in a mosque in Medina, Saudi Arabia. The remains of Buddha were cremated and placed in several different monuments, some of which survive to this day. Abraham’s remains lie in a cave in Hebron in the Judean hills. What is left of Confucius is in a large cemetery in Qufu, Shandong Province, China. L. Ron Hubbard, the founder of Scientology, had his remains cremated and scattered in the Pacific Ocean. Mormon founder, Joseph Smith, is buried in Nauvoo, Illinois.
The tomb in Jerusalem, where Jesus Christ was laid, is empty. There are no bones. No remains. No ashes.
No adherents to any world religion can say its founder is still alive. But followers of Christ can. His tomb is empty. He appeared multiple times to His followers after He rose from the dead. He talked to them. He ate with them. They touched Him.