(1) All contingent things have causes
(2) All contingencies require necessities to ground them.
(3) All natural things are contingent
(4) the universe is natural, therefore, the universe is contingent
(5) the universe requires a necessity upon which its existence is grounded, Therefore, the origin of the universe must be necessary.
(6)Since the origin of the universe must be necessary (from 2,4 and 5) and not contingent the origin cannot have a cause.
(7)The origin of universe is necessary and must be eternal and first cause, since this is the definition of God (see Rational Warrant page) then the origin of the universe must be God.
This version understands Necessity and contingency largely in causal terms. The necessity that creates the universe must be understood as eternal and uncaused for two reasons: (1) The impossibility of ICR, there has to be a final cause or nothing would ever come to be, (2) empirically we know the universe is not eternal. See the supporting material. Atheists will often argue that this kind of argument doesn't prove that God is the necessity that causes the universe. but being necessary and creator and primary cause makes it the sources of all thins we can rationally construe that as God.
I do not claim to "prove the existence of God." God is not just another thing in the cosmos. God is being itself, the basis upon which reality coheres. This is beyond our understanding so it is beyond empirical proof. I argue that God arguments prove that belief is rationally warranted, The do not prove that God exists nor do they have to. ultimately belief will not be decided based upon such matters but they may help to clear away the clutter.
Below are links to essays showing the Christian nature of this idea of being itself.
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Being itself source of consciousness
Bible God and the Depth of Being