Something can not come from nothing…it is basic logic and does not make sense. Did this dot always exist? If so, then this goes against the concept of time and means that the universe has existed for an infinite amount of time.
Therte was no time before matter existed ---spontaneous existence of matter has been seen in CERN with the Higgs particle. It is far more likely that a very basic particle spontaneously existed by the laws of physics (which are relevant to this universe and no other) than a super complex entity started it all.