I think that organized, politicized Christianity and Islam are very bad ideologies, and I call myself an antitheist on that basis alone. These systems of thought hurt their adherents in the ways I outlined earlier, and they hurt those around them both by promoting division, ignorance, and bigotry, and by trying to impose unwanted religious doctrine on unbelievers using the might of government.
All one needs to do to understand the effect this teaching has on a culture is to compare those embracing it to those embracing secular philosophies. Besides being an atheist, an agnostic, a rational skeptic, and an antitheist, I also call myself a secular humanist. I see it as an ideology that promotes intellectual and moral excellence, and extols virtues like autonomy, tolerance, self-actualization, education, compassion, reason, and human and civil rights. You just don't find those values coming from the pulpits. Instead we hear about what is abominable in the eyes of an angry and unseen god, submission, judgment day, and the kinds of ideas that I outlined in a lengthy left here post several hours ago.
No, not every theist is made bad by his religion. But the best of them are basically on par with the typical secular humanist, who tends to be rational and compassionate. The more you let one of those two ideologies influence your politics or the way you view the world and your fellow man, the worse of you become, and the worse it is for others.
I don't think that the word "antitheism" captures that attitude if taken to mean what its roots suggest. If anybody would like to propose a different name for it, I am all ears. I actually have no opinions about theism. I like some of the religions. I like the Jains, Quakers, and Zen Buddhists.