Vidqun-"If it is a simulation, would you not need a creator to create the simulation (as in the Matrix Trilogy)?"
Not necessarily no. That's limiting outside the simulation to what the simulation is inside.
If outside the simulation is so vastly different to what we experience in the simulation then maybe there is no beginning and no end, no up and no down, in fact it could be void of dimension.
Wild speculation obviously but equally as valid as any theistic hypothesis when it comes to assuming an alternative. The only advantage with simulationism is that it can answer every question thrown at it.