Question: How did the universe begin?

Sort of brought up with it, but in catechism class last year, we studied other religions. Most 'Christian' doctrines teach that God created the world, and I cannot see how a small dot exploded into something as vast as the universe. And how everything fell in so perfectly, it seems like nonsense to say that it all just appeared. Read several sections of the bible, and I believe it. It said in Genesis that the spirit of the Lord (Holy Ghost/Spirit) was hovering over some murky matter, and began to mold and shape it into the earth. With his Word, God created something out of nothing, a feat we still have to overcome. In the beginning was the heavens and the earth. Lucifer corrupted some other angels and fell(was sent) to hell. I would go on, but I don't want to be excessive.