Thank you to Erwin Morales for leaving this quote in the comments today. I have never read it before but was surprised how closely Nietzsche’s recommendation resembles my own experiment this year.

These serious, excellent, upright, deeply sensitive people who are still Christian from the very heart: they owe it to themselves to try for once the experiment of living for some length of time without Christianity; they owe it to their faith in this way for once to sojourn ‘in the wilderness’ — if only to win for themselves the right to a voice on the question whether Christianity is necessary.”

— Friedrich Nietzsche, Daybreak: Thoughts on the Prejudices of Morality (Cambridge University Press, 1997), 61.