Atheism is a disbelief in the existence of God or the belief that there is no God. Atheists actively reject the existence of God. However, this traditional definition does not capture the kind of atheism of many atheists, who simply hold an indifference to the issue of God’s existence.
Agnosticism is believing that either the knowledge of the existence or the knowledge of the non-existence of God is impossible. Often times, it is put forth as a middle ground between a faith and belief in the existence of a God and atheism, or the position that there is no God. Understood as the middle way, agnosticism is a skepticism about all things theological. Agnostics hold that human knowledge is limited to the natural world, and that the mind, on this earth is incapable of knowing or understanding the supernatural. An agnostic could lean more toward being an theist or an atheist. The former is called a fideist, one who believes in God purely on faith. The agnostic atheist simply finds no compelling reason to believe in God.