Does anyone else find it quite difficult to fathom having no beginning... Always existing... That means 500 trillion years ago or the equivalent of that, God would have been doing or pondering something ... What do you think he did?
Augustine of Hippo said to Yahweh,
anni tui omnes simul stant ─ 'all your years stand simultaneously
', the notion that there's such a place as 'outside spacetime' and that Yahweh is there.
That comes with its own problem. In this 'outside time' place there must be some kind of meta-time, otherwise there'd be no time. And if no time, then no change of any kind, simply the stasis of a old photograph.
If that's correct, then we need an exchange rate between time and meta-time, but 1000 time years = 1 meta-time day (365,250:1) is not the same as all years standing simultaneously in the Yahwehan gaze. So it's a mystery.
As for the problem of beginnings, my own view is that if spacetime is a property of energy (or mass-energy, if you prefer the term), rather than that energy exists within spacetime, then there's no problem with beginnings: time exists because energy exists, so the existence of energy is all you'd need.