Bottom line when you get right down to it all theory's of our existance, and the existance of the Universe, and all that it contains, is based on a set of assumptions that must be taken on faith. Science must first observe, ask an informed question, based on those observations, and after investigating many options come up with a viable hypothesis (an answer to this question). Then this hypothesis must be tested and the results verified by reproducing those results. In all theory's of cosmology, or creation, neither can the beginings of the universe, or life, be observed, nor can they be tested and reproduced. If it is possible to reproduce the beginnings of the universe, or life, then we would become the creator. Once you get past the testable hypothesis the rest, which is based on speculation, conjecture, and assumptions, must be taken on faith. And faith is based on what one believes which is founded in the worldview one holds.
I chose to base my worldview on what is known as the Word of God, The Holy Bible. From this I hold that there is a creator and that creator is the God proclaimed in the Bible. The concept of worldviews will have to wait for another posting.