Conservation of energy, there's very strong evidence for it. BTW, the word proof only has meaning in logic and mathematical constructions. It has no other use in science, only evidence does.
" It is an unknown, as it is an unknown whether or not God created the universe."
It's a known with real evidence. It's also illogical to think something could come from nothing. As I said previously, there's only one person that showed up and claimed to be God. His words are all there is to go on.
" And neither can someone prove that matter was created by God and that He has always existed."
If God exists, then He alsways existed. It's in the logic.
" Both are just OPINIONS and a PHILOSOPHICAL belief system. (emphasis only)."
They are judgements based on the evidence and logical perfection in the claims. They are not necessarily simple opinion. Their measure of truth lies in the inherent perfection of the logic and evidence that supports it. Simple opinion does not.
"If one cannot prove either, then what we have are creationists saying "We're right, and God does exist", and atheists saying "No, we're right, and God did not create the universe. There is no Supreme Being" "
No. The question of whether, or not there's a SBeing can only be answered by the being presenting himself and others judging. It's that simple.
" It all comes down to faith. Atheists believe by faith that God does not exist, and creationists believe by faith that God does exist...so...both groups are both in the 'faith camp,' so to speak. "
The only faith involved regards believing what someone tells you. No one can claim God doesn't exist per Occam's razor, as above.
Don't get me wrong, as I do believe in a creator.
The Bible says "that without faith it is impossible to please God, for they that come to God must BELIEVE that He is, and that He is a rewarder of them that deligently seek Him."
It all boils down to faith - for the believer and the atheist as well.