Amazing story of Tiamat, is it true?

I watched a video of a Michael Tsarion talking about origins and atlantis etc. He talks about a planet that use to lie in between Jupiter and Mars. A planet that was 15 times the size of Earth and was made-up of mostly oceans. This planet "exploded" thus creating the asteroid belt and the great flood. As the bible said water rained down from above, not risen up from below.

It is definitely possible that the asteroid belt is the remains of a long-destroyed planet.

The rest of that stuff is nonsense, though.