[Serious] Atheist Dogma

[Belacqua]

I see you don't understand what the words agnostic and atheist actually mean.

You are in good company. 

Unfortunately, the way natural language works is: a word means what lots of people use it to mean. 

If a significant percentage of people use it to mean "uncommitted," then that's one of the word's meanings. The dictionary can give more than one meaning, and in that case if we want to be clear we have to say something like "I mean agnostic in the sense of ____." Inconvenient but necessary. 

In such cases we can't really say someone is wrong; only that we wish the word was used differently. I dislike it when people use the word "secular" to mean merely "non-religious," but I can't stop anybody. Within certain circles, especially ones that operate like echo chambers, specific definitions may be demanded, but newcomers can't know that. 

Merriam Webster gives both definitions of "agnostic." David Mitchell is using it according to one of the definitions given.

Definition of agnostic (Entry 1 of 2)

1 : a person who holds the view that any ultimate reality (such as God) is unknown and probably unknowable

broadly : one who is not committed to believing in either the existence or the nonexistence of God or a god

2 : a person who is unwilling to commit to an opinion about something

political agnostics
agnostic adjective

Definition of agnostic (Entry 2 of 2)

1 : of, relating to, or being an agnostic : involving or characterized by agnosticism
2 : NONCOMMITTAL, UNDOGMATIC