Abstinence is a form of sex
Ignorance is a form of knowledge and silence is a form of noise
Correct. Ignorance is a lack of knowledge, silence is a lack of noise, atheism is a lack of gods, apolitical is a lack of politics.
I'm apolitical. I lack politics. I know it exists, but I don't get involved. I don't trust (believe in) politics. I'm asexual, I like - sorry lack - sex, I'm asocial I lack social interaction, I'm irreligious, I lack organized religion, I'm theist I have gods. Everyone has gods, though, in some sense, everyone is theistic, but militant atheists have no part of it, don't trust specifically in the God of their culture. So much so, apparently, that they know little about it. Which is fine. BUT the word literally means the theory, doctrine and/or practice of no gods. Atheist. The prefix a, in this context, means without. Theos means god and ism means theory, doctrine, practice. Atheism is the theory, doctrine and practice of lacking gods. All gods. God means, literally, mighty/venerated. My silly illustration of the man on the planes with the bovine dung as a god wasn't a joke. The shit literally saved his life when he was powerless to do so on his own. Fertility gods, probably the most common gods, are about sex and crops. Procreation and agriculture. Noting to do with creator of the universe the Bible.
Theism is the theory, doctrine, practice of gods, a is without it, but in some sense that is a theory, doctrine or practice of gods as well as theism is. Just the alternative. Consider atypical. If you are atypical, you are typically not typical in a general sense. All atypical things have a lack of being typical in some sense in common.