It is not a must be itself, it is a must because an eternal universe is impossible (by proof) not assertions
An uncaused cause is a must (God)
Why is it a must?
You're just making that up, because you can't yet see any other cause.
I agree, that something, 'God' .. whatever you would call it, is a possibility.
But your 'proof' is not proof! :|
If the universe can NOT be of uncaused origin, then why MUST your God be?
You cannot justify that, as you cannot prove it, and according to your much loved Cause & Effect principle, you would be wrong to assume an uncaused God.
But you will try and justify that by saying that God does not conform with such laws ..
An eternal universe has been disproven?
As far as i was aware physicists had 3 models on the universe, and only one of them was a non-eternal universe,
where's this proof from?