To exist or not to exist, that is the unicorn's question.

The belief that unicorns do not exist. More generally, a form of atheism that considers the proof that a deity exists to be no more convincing than the proof that a unicorn exists. — Urban Dictionary

<From Greek a = not, monokeros = unicorn (mono = one, keros = horn), ism = belief>

Since I cannot deny with absolute certainty that there are no gods, I decided to go with amonokerism to explain my beliefs.