Atheism is the view that God does not exist. It is not a sin; it is a perspective. Atheism is also not a new development. Psalm 14:1, written by David around 1000 BC, mentions atheism: "The fool says in his heart, 'There is no God'." Recent statistics show an increasing number of people claiming to be atheists (up to 10 percent of people worldwide). So why are more and more people becoming atheists?
The existence of God must be accepted by faith, but this does not mean belief in God is illogical. There are many good arguments for the existence of God. The Bible teaches that God’s existence is clearly seen in the universe (Psalm 19:1-4), in nature (Romans 1:18-22), and in our own hearts (Ecclesiastes 3:11). With all that said, the existence of God cannot be proven; it must be accepted by faith.
To make the absolute statement "God does not exist" is to make a claim of knowing absolutely everything there is to know about everything and of having been everywhere in the universe and having witnessed everything there is to be seen. Of course, no atheist (or anyone else) would make these claims. However, that is essentially what they are claiming when they state that God absolutely does not exist. Atheists cannot prove that God does not, for example, live in the center of the sun, or beneath the clouds of Jupiter, or in some distant nebula. Since those places are beyond our capacity to examine, it cannot be proven that God does not exist. It takes just as much faith to be an atheist as it does to be a theist.