There are 5 proofs of the existence of God. It is written by Aquinas. I give it below:
1. Proof through motion means that everything moving has ever been triggered by something else, which in turn was triggered by the third. It is God that is the root cause of the whole movement.
2. Proof through the generating cause - this proof is similar to the first. Since nothing can produce itself, then there is something that is the root cause of everything - it is God.
3. Proof through necessity every thing has the possibility of both its potential and real being. If we assume that all things are in potency, then nothing would arise. There must be something that contributed to the transfer of things from the potential to the current state. This is something - God.
Those are all "proofs" that god can't exist. I'll never understand why religious people don't ask the same questions about god. If all these things need an originator then so does god. He can't exist -- or be the original creator if we go by this logic. God would be, by definition, far more complex than us or the universe and therefor he also needs a creator. He can't just exist due to your own proofs. The truth is it's these flawed proofs that allow the religious to shut off their brain and just accept the easiest or simplest option to them -- which is, don't worry about it because god made everything. I'm sure there will always be unanswered questions about the origin of the universe but god or religions will never be able to answer them.