I can do that. Law of conservation of matter states that matter can't just come from nowhere. SOMETHING has to be exchanged for it. Now, it's illogical that the universe has "just always been there" so it must have appeared that some point along the way.
You've raised two contradictory points - either matter can't just come from nothing, in which case matter has always been around, or it can come from nothing, in which case it hasn't necessarily. Which is it?
The problem is, the law of conservation of mass
When you get to the beginning of the known universe, there is no law of conservation of mass - only of energy. A minor nitpick, but you should really be asking where energy came from, since mass came from energy.
doesn't allow for this stuff to just start getting created on it's own, so technically we should exsist. However, science is currently not able to understand the material the spirit is made of
Before you talk about understanding the spirit, you might want to provide evidence that this thing exists.
There, just backed up my beleifs with science for you. God bless.
No, you cobbled a rudimentary understanding of science on to an age-old argument for God, namely, the Cosmological Argument. Rather than responding to the above, you might want to concentrate on the following:
The CA essentially says that the universe, multiverse, metaverse, whatever, needs a creator, otherwise it couldn't exist. The painfully obvious retort is, "well, what created God?" The (equally obvious) comeback is, "nothing! God doesn't need a creator!"
But if there's something which doesn't need a creator, then that thing may as well be the universe as be God. If God existed forever, or if God just popped into existence, or whatever else, then those same properties can be applied to the universe. You thus lose your ability to say that the universe must have been created.
A common way of trying to get around this is to claim some property which implies the need for a cause or a creator. Often this is stated as, "anything that began to exist needs a cause. The universe began to exist, therefore it needs a cause - that cause is God."
The problems are twofold. Firstly, you have no reason for stating that the universe began to exist. Sure, there was the big bang, but there could have been something before that, we just don't know. Secondly, to say, "God" is to imply certain properties for this cause - omnibenevolence, personality, prayer-answering are some common ones.
But, "cause of the universe" does not in any way imply "omnibenevolent, personal, prayer answering deity." It's just "cause of the universe." You've not got evidence for anything else. So even if your argument worked, which it doesn't, it doesn't prove
God it merely proves a
cause. In life, causes are usually pretty mundane and not godlike at all.