ratiocinator
Lightly seared on the reality grill.
Atheism looks like religion, smells like religion...
Except it quite obviously doesn't. No matter how much some atheists are religious, or some atheists get together for meetings that look like religious meetings, doesn't mean that atheism is any of those things. The word has a simple, straightforward meaning that describe a lack of belief in gods.
FFS this isn't difficult!