One of the things that seems to cause confusion amongst the religious is the way science describes the big bang. It gets described as the creation of all matter, space, and time...so naturally, religious folk seem to conclude that these things don't exist "outside" of our universe.
The thing is though, that we can only describe what's "inside" our universe since that's all we currently have access to. So when science says the big bang created all matter, space, and time...they are referring to "inside" our universe...not outside.
The reality is, they have no idea what exists outside of our universe. There could be matter and energy, space, and time...we simply don't know.
So to jump to the conclusion that whatever "caused" the big bang (if indeed it needed a cause) cannot be made of matter, take up space, or exist "in time" is erroneous. It assumes a lot of things about what exists outside of the universe that science does not assume.
Does that make sense to you?