Creation screams creator. The universe exhibits things that can be measured and shown to have a beginning, just like time. If you do not believe in God, are you a naturalist? If so this means there is nothing beyond the physical world, which I would say is madness considering history. The debate of God's existence falls to a debate of naturalism and super naturalism. What good reasons are there to believe that super naturalism is true? Here's a few
#1 The origin of the universe points to the existence of a transcendent creator. Where did the universe come from? Why does everything exist? Naturalists typically say that universe is just eternal and un-caused. But there are good philosophical and scientific reasons to doubt that this is the case. Philosophical the idea of an infinite past seems absurd, if the universe never had a beginning that means that the number of events in the past history of the universe is infinite. Mathematicians recognize that the existence of an actually infinite number of things leads to self contradiction. Example, what is infinite minus infinite? Mathematically you get self contradictory answers, thus infinite does not exist in reality and is just an idea in your mind. However, that entails that the number of past events must be finite so the universe must have begun to exist. This conclusion has been confirmed by astronomy and astrophysics. We now have pretty strong evidence that the universe is not eternal in the past, and had an absolute beginning about 13 billion years ago in the big bang. Any universe on cosmic extension CANNOT have an infinite past. A atheist proponent of the big bang must believe that the universe came FROM nothing and BY nothing. So why does the universe exist? There must have been a cause that brought the universe into being.
#1 whatever begins to exist has a cause
#2the universe began to exist
#3 the universe has a cause
Now as the cause of space and time, this being must be uncaused, timeless, space-less, immaterial being of unfathomable power. Moreover it must be personal as well, why? Because this cause must be beyond space and time, therefore it cannot be physical or material. Only 2 things fit that description, abstract objects like numbers, or else and intelligent mind. Abstract objects can't cause anything, so it therefore follows that the cause of the universe is a transcendent but personal mind. So we are therefore brought not merely to a supernatural cause of the universe, but to its personal creator.
The existence of intelligent life literally defies human comprehension. If the force of gravity (or atomic weak worse) had been altered by as little as one part of 10 to the 100th power the universe would not have been life permitting. There are only 3 possible explanations of this "fine tuning", physical necessity, chance, or design. It cannot be due to physical necessity because the constants and quantities in question are independent of the laws of nature. Could it be due to chance? The probability that all the constants and quantities is essentially mathematically zero. It is like diving 1 by 10^100th power, ask your math professor what the answer to that is and he will say 0. (that is unless he is an atheist and knows why you are asking the question...but then that would be a bias)
Dr. William Lane Craig Biola University. These are the first 2 points of his standard argumentation for God's existence, look it up and you will find all his sources he uses for the mathematic numbers as well as the scientific evidence.