However, I do know from the Bible that worldly fame and great talent can't take anyone to heaven.
The only one who can save is Jesus Christ. By faith in Him you can be saved, guaranteeing you a place in heaven for all eternity, regardless of your popularity, talent, or wealth.
Did Muhammad Ali ever place his faith for salvation in Jesus Christ and Him alone? Only he and God know that for sure. The one thing we do know is that, sadly, at one time he embraced the tenets of the false religion of Islam. The false god Allah cannot save, and the only thing that matters to Muhammad Ali now is his relationship with Jesus Christ.
This is what the Bible says about how to be saved:
Being world-famous doesn't save anyone from Hell. Having a fortune in worldly wealth doesn't purchase a place in heaven.
God is not impressed with worldly fame, or great riches or professional talent.
God sent His only begotten Son Jesus to die on the cross to pay for Muhammad Ali's sins. God offered him the free gift of eternal life, if only he would believe on Jesus Christ and call out to Him for salvation. God gave Muhammad Ali 74 years to accept the free gift of eternal life.
Did he ever receive Jesus as his personal Saviour? If not, it is eternally too late for him.
But it is not yet too late for you. Only Jesus Saves!