Let me also try some answers as this indeed touches infinity:
1. assuming someone, or something, created us in a certain way. what makes us/you sure that he/she/it is still alive?
We can not be sure, but it's likely. A being that created us must be very powerful. If it died, then only by its own decision. It is unlikely that such a being died for natural causes.
Contrary to popular belief, hearing God talking in your head is not necessarily a proof that God is still alive. It could also be a hint that you should see a doctor.
2. is it important to you that he/she/it is still alive?
Certainly. We often tend to believe that something is not what it seems, but we hardly ever have proof. If God still existed, then our world would not be what it seems, but were controlled by a hidden being behind the stage. That would be nice to know.
4. can gods die?
5. can God (he/she/it) die?
Sure. God is defined as omnipotent, so he can do everything, including die.
6. assuming that God is the spark that set the universe into existence, is it possible that the conversion from energy to matter is the creation itself (big bang) and thus God sacrificed himself to create the universe?
7. assuming 6 is true, will god resurrect when the universe collapes into a single point?
No, the conversion from energy to matter could not have been the creation itself. Conversion from energy to matter happened about 380,000 years _after_ the big bang and is well understood, so it leaves no space for supernatural events.
