Why not deism?

[Inqwizitor]

Inqwizitor:
"If theism requires faith, and atheism is a lack of faith: deists claim to acknowledge a causally necessary being with no faith or revelation, so on that score, it isn't a kind of theism but a kind of atheism, unless atheism means more than just a lack of faith."

Atheism is a lack of belief in god(s). Atheists could still have faith in something, faith being a belief unsupported by evidence. Not all atheists are sceptics.

This is a key semantic point, and warrants its own thread (I'm sure you've had many already and I'm reluctant to start another). It is not a complete theory of justification to categorically deny that faith is unsupported by any evidence: there can be either direct evidence via authoritative testimony, and circumstantial evidence, or both. Faith is belief that is unsupported by empirical or logical proof.