"How would the matter the universe is made of have been created without a God? It couldn't, because that would be violating the laws of physics, and it can't do that on it's own, it needs God to do it. Well who created God, if he created the universe, you ask? God couldn't be created because there was no time before the universe began (as time is a dimension of the universe), and creation needs cause and effect, which requires time. So God was just the only thing to exist before the universe. (I say before for a lack of a better word)
What about the multiverse theory, you ask? Well I say, what about occam's razor? One universe with God is much simpler and has much less assumptions than infinite universes.
So, assuming the universe exists, I have proven God."
Okay, brief list of flaws:
1. Appeal to ignorance- just because we don’t know the cause doesn’t mean that your explanation is right.
2. Damning the alternatives- similarly, just because you aren’t satisfied by the “it always existed” possibility doesn’t mean that your explanation must be correct.
3. Fallacy of Composition- you assume that the universe as a must have a cause, on the basis that the matter inside it must have had a cause.
4. Unjustified assumption- there can be no infinite regression of causes
5. Conclusion which denies premises- Nothing can be created outside time, but God created the universe. Time only exists within the universe, so god clearly created outside time.
6. Apples and Oranges- your comparison of the simplicity of many universes as opposed to a God is bogus. You might as well see a sand dune and say, “there must be a massive marble in there holding it up, because that is far simpler than saying that there are millions and millions of sand grains”
I’m sure in my quick look at this, I have missed a number of fallacies. Apologies.