Occam's razor for one. Adding god solves nothing, it deepens the problem. See god is by definition impossible to understand, so if my goal is understanding why on earth would I want such a thing?
And secondly, the descriptions of the universe, however counterintuitive they may be, are at least based on some kind of physical observations.
And for a third, the universe is still based on matter. god apparently is not. The first makes sense to me, the second does not.
Actually, following Occam's razor, God is the simplest explanation.
Let's say that everything must be created, and that was done by an omnipotent God. A God which stands above time, space, moral and existence, which is self containing and in himself has his own cause. This entity can surely be replaced by the known world. The world stands above time, space, moral, existence, is self containing and in it has it's own meaning.
Occam's razor is actually a good argument for the existence of God. I will explain why
Contrary to the statements above, the universe cannot replace God as explanation for its own existence. The universe is finite in both size and time. The universe had a beginning in finite time at the moment of the Big Bang. How did this universe decide to create itself? How did the universe design itself with physical laws and parameters exactly fine tuned to support life?(Yes, the finetuning argument again).
The laws of physics are designed with such precision that it is almost inconceivable that they could be the result of chance. For example, take the ratio of the number of electrons to protons. This ratio must be exactly equal to one to one to better than one part in 1037 (10 to the 37th power, or "1" followed by 37 zeros), otherwise electromagnetic forces would have superseded gravitational forces and no galaxies, stars or planets would have ever formed in the entire history of the universe.
The likelihood of this occurring by chance is described below:
One part in 1037 is such an incredibly sensitive balance that it is hard to visualize. The following analogy might help: Cover the entire North American continent in dimes all the way up to the moon, a height of about 239,000 miles (In comparison, the money to pay for the U.S. federal government debt would cover one square mile less than two feet deep with dimes.). Next, pile dimes from here to the moon on a billion other continents the same size as North America. Paint one dime red and mix it into the billion of piles of dimes. Blindfold a friend and ask him to pick out one dime. The odds that he will pick the red dime are one in 1037.11
Other constants of physics, such as the expansion rate of the universe, are fine-tuned even more delicately, as small as one part in 1055. Random chance does not design such a well-crafted universe. All the atheistic explanations for such an exquisitely defined universe require the presence of trillions of other universes, of which ours is the one which happened, by chance, to have the exact physics required for the formation of galaxies, stars and planets. Therefore the atheistic explanation actually goes
against Occam's razor since it requires some mechanism by which universes can sprout from some super universe and randomly change their laws of physics. If one were to calculate the number of universes required, by chance, to have the exact physics required for the formation of galaxies, stars and planets, it would exceed 1010000 (talk about multiplying entities!). The mechanism by which physical laws could randomly evolve would add further complexity. Design by an intelligent designer is obviously a much simpler explanation.
The statement that "the world stands above time" is false. The universe stands within time, having come into existence at time = 0. See Stephen Hawking, A Brief History of Time.
"Most theists agree that God has a nature. Then we must raise the question, who created God's nature? If we just accept that God has a nature and exists without a cause, why not say that the known world just is and that the laws of physics are what they are, without a cause?"
God is uncreated, therefore His nature is just as eternal as He is. Although it is possible the universe and the physical laws could exist without a cause, 1 in 1010000 is not exactly what one would call good betting odds. It would be much more likely that your car's engine would thermodynamically reverse itself (i.e., freeze solid instead of warm up) every time you started it.