You probably just didn't except it.
Secular refers to things that are simply not considered sacred in a given context. For example music can be secular or sacred depending on the subject matter.
Atheism is a belief that there are no deity's.
These things aren't even the same.
An atheist who has a cross in their home does make the object secular because he doesn't believe in its symbolism.
A theist who sanctified his entire home does not make his shoes sacred.