The universe's creation is explained by the big bang theory. The explanation for the big bang is a recycle of the expansion of the universe. As the universe expand with the force caused by the initial explosion, over billions of years it will then collapse back onto itself. Right now it's still accelerating outwards with increasing speed. Think of it like a basket ball. All the lines represent the path of the planets. It starts from one end, explode, and then collapse at the other end.
This is an indefinite cycle and each time, the law of physics is altered but gravity will always exist. The law of physics is very different in 3 different scenarios. It's different for the very small which scientists have discovered and been researching. It's different for "normal" that was discovered by Newton. And if the theory is right it is very different for the very large (planets and galaxies). Right now we don't know much about that physics so we create a fictional phenomenon call "dark matter" and "dark energy" that has yet to be proven (so it can fit our "normal" physics).
In order for life to exist (ACCORDING TO OUR UNDERSTANDING) we must have a moon about the size of 1/4 of earth's diameter to help stabilize temperature, we must be a certain distant from a sun so we don't burn or freeze, and there must be water and sunlight. But we have discovered some organisms that live deep under water that doesn't use sunlight. It creates energy form chemicals found on the deep ocean floor created by lava flows. This means that there might be other "living" life forms near us that we cannot understand.
Our sun is getting old and it's also expanding. It will eventually turn into a Red Giant and turn Earth into Mars. Our Moon is slowing moving away from us at a few inches a year and soon our planet will wobble out of control and we will have months of burning and months of freezing temperature and the days will get longer and longer. When the moon was formed, earth days lasted 4 hours. The core of our planet that creates the ozone layer to prevent the sun's radiation is slowly cooling and will eventually disappear.
So yes, there is a God.