What is gravity?
My comment about the video I that says that gravity is what pulls things down. But that is not merely what gravity is.
"Gravity or gravitation is a natural phenomenon by which all things with energy are brought toward (or gravitate toward) one another, including stars, planets, galaxies and even light and sub-atomic particles. Gravity is responsible for many of the structures in the Universe, by creating spheres of hydrogen — where hydrogen fuses under pressure to form stars — and grouping them into galaxies."
https://en.wikipedia.org/wiki/Gravity
With a correct definition of gravity we can call this video a straw man argument. For atheists gravity created the universe. For Christians God created the universe. For theistic evolutionists God used gravity to create the world. Gravity as that which "pulls" things to the center of a globe is a necessity. On a flat earth the mass, density, weight of a thing keeps it from floating in space.
--Dave