There is speculation that this is not our Earth but one from a parallel universe,
meaning that BSG also takes place in an alternate universe.

If a fleet of ships like that did arrive at our Earth now, I wonder what the
reaction would be?

My other question for the series is, who exactly are the gods? Are they
just myths or are they aliens or AI? Note that the ancients who wrote
about the gods did so during a time when they were not relatively primitive
like our ancestors were, but had technology and spaceflight.

A good series overall, but sadly not someting I can show my kids like
I can with the original Battlestar Galactica.