I take it that you have decided to consider it a religion, and want a term like monotheism or pantheism to convey the idea that no deities are needed to manifest the world. Historically, atheism served just fine. Nowadays, Nontheistic is the normal adjective, particularly with regard to creation myth. Also consider Ietsism, which makes a point of not assigning deities to particular chores.
Question: What's the Difference Between Nontheism & Atheism?
Answer: In principle, there is no difference and should be no
difference between nontheism and atheism. Nontheism means not
believing in any gods, which is the same as the broad definition of
atheism. The prefixes "a-" and "non-" mean exactly the same thing:
not, without, lacking.
Nontheism was only created and continues to be used in order to avoid
the negative baggage that comes with the label 'atheism' due to the
bigotry of so many Christians towards atheism. Thus if there is a
difference between nontheism and atheism, it lies entirely in the
attitude of the speaker towards atheism: an atheist is a person who
doesn't believe in any gods and isn't ashamed to say so; a nontheist
is a person who also doesn't believe in any gods but may be ashamed of
it on some level and doesn't want to be associated with all those
dirty atheists who won't stay in the closet.
The earliest usage of non-theism may be from George Holyoake in 1852.
According to Holyoake:
Mr. [Charles] Southwell has taken an objection to the term Atheism. We
are glad he has. We have disused it a long time [...]. We disuse it,
because Atheist is a worn-out word. Both the ancients and the moderns
have understood by it one without God, and also without morality.
Thus the term connotes more than any well-informed and earnest person
accepting it ever included in it; that is, the word carries with it
associations of immorality, which have been repudiated by the Atheist
as seriously as by the Christian. Non-theism is a term less open to
the same misunderstanding, as it implies the simple non-acceptance of
the Theist's explanation of the origin and government of the world.
Note: the above two paragraphs are the quote as reported by James Buchanan in Modern Atheism under its forms of Pantheism, Materialism, Secularism, Development, and Natural Laws, 1857
The source for the quote is Holyoake's The Reasoner", New Series, No. VIII. 115, 1852.
George Holyoake at least adopted a positive-to-neutral attitude.
Today, usage of non-theism is more likely to be accompanied by a
hostile attitude towards atheism: people insist that nontheism and
atheism cannot mean the same things and that while atheism is dogmatic
and fundamentalist, nontheism is open-minded and reasonable. It's the
same sort of argument heard from people who are convinced that
agnosticism is the only "rational" position to have.
both blocks from here: http://atheism.about.com/od/Types-Atheism-FAQ/f/Difference-Nontheism-Atheism.htm