Atheism: Disbelief or lack of belief in the existence of God or gods.
I chose this picture because it says "Imagine no religion" and atheism means the disbelief of any God. It also says freedom from religion which sounds like an atheist program.
Agnosticism: One who believes it impossible to know anything about God or about the creation of the universe and refrains from commitment to any religious doctrine.
I chose this picture because a agnostic person doesn't believe in any religion's knowing of God. This shirt represents that.
Theism: Belief in the existence of a god or gods, especially belief in one god as creator of the universe, intervening in it and sustaining a personal relation to his creatures.
I chose this picture because theism means the belief of a God that created the land and that represents Christianity so I chose a cross.