"I don't care what you believe if it does no harm."
First, I self identify as an apatheist. I know gods I've created exist on paper as does all those of ancient oracles and fellow fantasists. How they exist beyond being written is a source of conjecture. Not knowing makes me agnostic...I do not claim knowledge.
As far as what I claim no knowledge of I don't care. In creating my own fantasy pantheons, I've studied a lot of religion, mythology, paganism, spirituality,... many god theories I have no concern of how or to what degree they exist beyond print...
...where said beliefs affect others. Here we are confronted by some terrible gods indeed! Throughout the history of humankind the religions in power have created echelons of individual, civil, political and international injustices.
Today, these threaten the very existence of our planet's ability to sustain life. Our society, with religious substantiation of rampant pollution, global warming denial, profit over people,... these are issues which do concern me.
Still, I will not self identify as an antitheist. The title itself carries a connotation of bitterness exclusively toward the religious and, to my experience, I've found this to be too often true.
Also there is the common misconception antitheists are all militant, all part of far left extremist groups. There is no evidence of this to my knowledge but of what need is evidence to a gnostic?
I have no issue with what anyone believes or what they think they know. However I will when their actions as a result of these beliefs adversely affect others.