A couple of questions, beginning with omniscience:
If he already knows whether you go to heaven or not, how is it your fault if you do not?
And if you do have an actual choice in the matter, how can he know in advance? What exactly does timeless mean in this regard?

How can a timeless god turn from killing almost all of humanity except Noah to supporting just one people to loving the entire world? If he is timeless, should he not have the same opinion/traits etc. over our entire timeline as he would be the same at the beginning and the end of it given that it would not apply to / affect him?

Why can god be self-existent and the universe cannot?