You are the theist, the one who is proposing the existence of something, your supreme all-powerful deity.
We, the atheist, say you have no evidence that would justify considering your claim as even reasonable, let alone valid. So, no, we don't assert "there is no god", we assert, "you, the theist, have no evidence that would warrant considering your extraordinary claim as even plausible, let alone likely".
Or are you going to continue being dishonest about this?
1 archaic : ungodliness, wickedness
2
a : a disbelief in the existence of deity
b : the doctrine that there is no deity
http://www.merriam-webster.com/dictionary/atheism
Who is being dishonest now? Disbelief is still a belief. You are still making conclusions that there is no god with a complete lack of evidence in either direction. I think what you are defining is whats called agnostic.
Agnostic:
: a person who does not have a definite belief about whether God exists or not
: a person who does not believe or is unsure of something
Full definition:
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 who is unwilling to commit to an opinion about something
http://www.merriam-webster.com/dictionary/atheism?ref=dictionary&word=agnostic#