Comets come from the coldest parts of the universe and contain ice and organic materials. Scientists believe that impacts from comets on earth are responsible for contributing to organic materials and possibly life on earth.
Because the Moon has so many impact craters, scientists believe that this was caused by meteoroids, asteroids, and comets colliding into its surface at an average speed of 20 kilometers per second. The Moon's surface has millions of both simple and complex impact craters.
There are scientists that believe in a god and there are scientists that don't. Surveys find that a large majority of scientists do not believe in a god and even fewer believe in a creation account of the world.