Antitheism

[Mister Agenda]

Their definition is just fine. You fail to understand language. Look up active in the dictionary.

Let me be more polite here.

Your definition is not wrong. Neither is theirs. You are simply seeking to get out of it in a dishonest manner. I don't know precisely why - maybe political corectness, who knows?

ac·tive
ˈaktiv/
adjective
adjective: active
1.
(of a person) engaging or ready to engage in physically energetic pursuits.
"I needed to change my lifestyle and become more active"

2.
doing things for an organization, cause, or campaign, rather than simply giving it one's support.
"she was an active member of the church"

Definition 2 would be the one that applies to antitheism.