For the wrath of God is revealed from heaven against all ungodliness and unrighteousness of men, who by their unrighteousness suppress the truth. For what can be known about God is plain to them, because God has shown it to them. For his invisible attributes, namely, his eternal power and divine nature, have been clearly perceived, ever since the creation of the world, in the things that have been made. So they are without excuse. For although they knew God, they did not honor him as God or give thanks to him, but they became futile in their thinking, and their foolish hearts were darkened. Claiming to be wise, they became fools, and exchanged the glory of the immortal God for images resembling mortal man and birds and animals and creeping things.Did you catch that? The Bible says that everybody knows there is a God. It's obvious, based on the evidence of God's creation - the creation points to a creator. But did you notice the sinister plot that's mentioned? It says that the unrighteous know the truth, but try to suppress it (which is a fool's errand, since according to this Scripture, deep down everybody knows the truth anyway). Don't try to pull this Scripture on one of them, of course, because their folly runs so deep that they certainly won't listen to the clear truth of God's Word, but I have a little bit of logic you could try.
(Romans 1:18-23 ESV)
Let's think about science for a moment. Science tells us that everything has a start and a finish. I, for example, was born one day (this occurred nine to ten months after I was conceived), and one day, if the pattern of all of recorded history holds, I can expect to die. Animals are born and die. Science even tells us that planets and stars have a beginning and an ending. Science is all about trying to find a cause and effect for things, because science tells us that everything has a beginning, and everything has a cause.
Now, let's rewind backwards. Let's rewind WAY backwards. I don't care how far you go... go back to the very beginning. Let's say the "Big Bang" theory is correct and the entire cosmos started from a catastrophic explosion. Science tells us that the explosion has a cause. What was the cause? Tell you what, I won't go the obvious route... let's go with space aliens. Let's say they used technology to seed the cosmos, which didn't exist before.
What caused the space aliens?
You can see that this logic is going to go on and on forever, and become more and more outrageous and convoluted, until eventually you give up and come to a brick wall. Everything has a cause, but one thing is the cause of everything. Something started it all in the first place, and that thing did not have a cause. It existed outside of the rules of cause and effect. In fact, it created cause and effect. That thing, whatever form it takes, is the definition of "god."
This argument does not prove the identity of the God of the Bible by any means, but I think the rules of logic point, as clearly as the laws of nature mentioned in the Scripture from Romans, at the existence of God. If someone calls himself or herself an atheist, I would like to submit that either he has not thought his beliefs through to their logical conclusion, or that he is deliberately concealing what he already knows, deep down, to be true.
There IS a God. It's only logical.