Wow, what a question. Everything that follows is based upon "current thinking" and we have got that wrong many times before). The "space we know" was "created" around 14 billion years ago. That mean that if we "reversed" the current expansion of the universe, it would come to a point 14 billion years ago. Humans are unlikely ever to get outside the solar system (our little piece of the action). With the fastest rockets ever created on Earth it would take us around 10,000 years to get to the outermost parts of our solar system. To get to the nearest star, 250,000 years. To explore another nearby galaxy, Andromeda for instance (our nearest neighbour (in galaxy terms) around 3 billion years. You wouldn't be back for tea! These are all "local". Most of the "Universe we know" is MUCH further away. As to who created the universe? No idea, does there have to be a creator?
Where and when did space first exist ? How infinite is space? If humans have never been that far, how was space created? And who/what created the creator of space?
Many modern people are so focused on finding out why/how something is. What people tend to ignore (and often get things wrong from) is because they aren't looking at what they're missing or don't know. If we take a look at what we don't know, rather than going back and trying to re-explain our obvious failure with even more ignorance AND arrogance, we should look at what's missing.