Before I go to vincit veritas' post, my gut reaction about heaven, creation and time-
I don't think in terms of a concrete heaven, with clouds and harps and stuff.
It might be rest, or answers/understanding/satisfaction, it's a bit nebulous. What it isn't, is a perfected form of earth. Our relationships won't be the same, so while we might be reunited in some way with nearest and dearest departed, it won't be all 'hooray, granny jones, great to see you! Have you seen uncle Bill?'.
Time- well physics is pretty woolly about time as I understand it. Aren't we all in parallel overlapping spirals of existence or something, with the possibility of poking holes through to other points?
So I'm pretty content to stay woolly about creation, beginning, end.
Equally there is no real moment of judgement, or sorting into heaven and hell. I don't see why God would judge someone on how they feel/believe at the moment of their death, when S/he is eternal. For me, we get some kind of perception of truth, and get to decide whether to opt in or out.
For me, the whole shebang is outside human understanding. We have no words, no concepts for that level. Well, the astrophysicists might, but I don't.
The creeds (speaking about Christianity) are both specific and vague. There is so, so much room for interpretation of language.
That's where maths wins, I believe. Certainty or at least clarity.