The universe is a loop, alway expanding to its limit then compressing back into a singularity. Questions of how it all started are moot its has always been going on. If there is an Overbeing, then they are not bound by our petty perspecitve of time. Imagine if you stood outside of time, all at once
Everything is currently happening
Everything has already happnen
Everything is yet to happen
This would be the nesscary point of view of the creator of the universe, so when is not so important as it relates to why, but rather the essence of the act.