noun

A person who believes that nothing is known or can be known of the existence or nature of God or of anything beyond material phenomena; a person who claims neither faith nor disbelief in God.

Although not all Skeptics are agnostics, as an agnostic himself Dr Groves sees no evidence for accepting or rejecting the idea of any belief.

sceptic,doubter,questioner,doubting Thomas,challenger,scoffer,cynic

adjective

Relating to agnostics or agnosticism.

So that wrestling is characteristic of my religious or agnostic poetry, but not necessarily everything else I do.

sceptical,doubting,questioning,unsure,cynical,unbelieving,disbelieving,non-believing,faithless,irreligious