I mean that I can not prove that a god or gods do noet exist.
Thank you for answering my question!
Although that does seem to contradict your assertion that only nature exists. It seems to me you're only a "non-atheist" on a technicality--a definition of the word that essentially means there is no such thing, since no one can "prove that a god or gods do not exist." Which means that all those people who call themselves "atheists" aren't really atheists.
*Agnotsic* may be the term you’re looking for.
http://www.merriam-webster.com/dictionary/agnostic
agnostic
1: a person who holds the view that any ultimate reality (as God) is unknown and probably unknowable; broadly : one who is not committed to believing in either the existence or the nonexistence of God or a god
2: a person unwilling to commit to an opinion about something