It is a VERY BIG topic @anniemohler, but I would like to comment if i may.
There is a FACT that we are all exist. And like all thing that exist, we require a CAUSE which means something can´t just come out from nothing...

So knowing that US has a beginning, is important to understand who is GOD is. Although we can explain how we did have a beginning (like the beginning of universe through BIG BANG) but we do not know what is the CAUSE of that beginning.

If you would say that I can´t prove there is a CREATOR or I can´t see what happen before it began then I would say neither can´t you DISPROVE it

And by observing the reality of our world and our existance, of how complex the human body or how the order of our solar system or how organized the colony of bees and ants in building and guarding their home..there is no reason for NOT believing to a CREATOR

Then you may ask, what was the CAUSE of the CREATOR and this question can be asked for ever and ever, which would leave us to NEVER been created.
An example: if you are a sniper that would shoot a target and you asked the confirmation of your commander, and your commander asked his superior and his superior asked his superior superior and go on unlimitedly, Then what happen is the shot will never be taken

So for a GOD to exist, it must require to exist without a BEGINNING therefore not requiring a CAUSE of the existance which means GOD is ETERNAL, TRANSCENDENT, and not bound by any of the boundaries HE created (whether it is time, space, or matter).
For instance, when Steve Jobs created an iPhone he doesn´t become the iPhone. And of course we can argue that God is ONE which makes the most sense and also to avoid the potential conflict between TWO or MORE disputing All Powerful GODS with conflicting interest.

I hope that would enlight your day a bit, if you want to discuss more I am more happy to do it:)