There has to be a first cause.
A first cause for creation.
A first cause for us coming to Him, and wanting to come to Him.
God must be that first cause. It's the only thing that makes sense.
It's the only thing that made sense when I was a child, not even knowing, really, how to think. It's the only thing that makes sense now, logically, and by faith.
Not believing doesn't make sense. I don't know how people do it. I always wonder if they're just kidding...