People
Like all ardent agnostics, Martin was a religious man.
— Sinclair Lewis • Arrowsmith

Behind the line May contain spoilers.
Our reading
An editorial interpretation.
The narrator wryly claims that committed agnostics are, in their own way, religious. The paradox is gently ironic: someone so devoted to questioning belief shows the same seriousness, intensity and preoccupation with ultimate questions as believers do, only aimed at doubt instead of faith.
Context reviewed