How can we tell that there is a God simply from looking at the evidence of the universe? There is a very interesting argument known as the Kalaam argument, which basically traces the existence of God and/or intelligent design through the natural universe. The argument (also known as the cosmological argument) consists of three parts. I will outline them as follows:
Part One - Nothing currently exists without being caused. Ever try to conceive of something without being able to imagine a cause? Look around you. Maybe you are working at a desk while you read this. How did the desk get there? Because someone created it. For everything that exists, there was a cause. This is common sense really, so lets move on to the next point.
Part Two - The Universe Exists. With the invention of the Hubble telescope, man was able to see in much greater detail the galaxy in which he exists. This is a humbling and daunting thing. Galaxies, nebulae, stars, and the universe are all vast... we are so small. There isn't much left to explain here: anyone can see that the universe currently exists!
Part Three - Therefore, the Universe Has a Cause. This seems like no big deal at first, right? But think about it, science tells us that there was a Big Bang that occurred stemming from something called a singularity. Materialists and Atheists used to maintain that the universe has always been, and will always be. We now see much scientific evidence to the contrary. The universe had a beginning and will have an ending. It is winding down. The real question then is who or what caused the universe?
Fine then. There is still a loophole though, right? So what if the universe was caused; that just pushes back the question farther to ask "who caused God?" Not so fast. Lets move back to the example of the desk for a moment. If I created the desk that you see in front of you, then I am necessarily outside the desk. In other words, it is possible to create something and then be apart from that something - to exist outside of the boundary and control of that thing which was created. This is how God can exist without a cause. Time and space did not exist until He created them for us. It is His creation, so He is not subject to its rules. This is difficult to envision for us because we know of no such conditions here on earth. But in fact that is just what the Bible relates to us through scripture. That God has no beginning and no end. He is the same yesterday, today, and tomorrow. I personally could imagine no other force able to create such a complex system as a universe. Can you?
