What is a myth that is passed from generation to generation, and people still believe it?

The myth that Jesus was a real person who was the son of god, and he died on a cross for our sins.
Been debunked long ago.

That God is dead. He most certainly is alive. He lives in my heart and thousands of others who believe in Jesus and His Heavenly Father and Kingdom. He was so much more than just a Rabbi. He is the Savior of the world, appointed by his Heavenly Father. None other was approved. No one else is sinless, like Jesus.

I remember someone’s definition of myth as a made up story that’s true. The example was George Washington and the cherry tree. Totally made up but why? At the time it was first told, the USA is a new nation. Making the President look honest meant other countries will be treated honestly.

Most of ancient mythology have long tales that are about great deeds and moral guidance.

Evolution

That the existence of afterlife cannot be proved; that we can perhaps only find out when we're dead.

the elusive unicorn