You celebrate that you are free from the guilt and fear that had been hanging over your head for all those years you'd been a believer. That is close to the path that I actually took in my departure from Christianity, except for the dragons.
For some reason I found this funny.
Dioptre:
Back to the original post, I was a fundamentalist Christian in my early twenties. Now I'm an agnostic. Or an apathetic atheist.
I did not convert to atheism/agnosticism. I de-converted piece by piece from Christianity. This is easy to do.
Why?
Because the object of religious belief on any kind is to suspend disbelief in the unreal. Think about it. Why do you go to church, bible study, fellowship or whatever on a regular weekly basis? Why are there so many exhortations to keep the faith, keep fellowship etc that you've heard? How many sermons have you heard about the perils of backsliding? Because reality represents a constant challenge to those religious beliefs. All the time. Every day. Why do so many sermons warn against reason and logic and the application of those things to the religion itself? Must people prefer insanity to sanity?
It's funny, but now as a naturalist and agnostic, I need no reinforcement, since my beliefs are congruent with testable reality. There is no cognitive dissonance. I don't need to meet with others to sing and dance about the law of gravity or the theory of evolution or the wonders of science. I don't spend any time on some ancient book of dubious history and morality looking for some secret pearls of wisdom.
I've stopped my membership of the "Self Watchers club". I'm no longer oscillating between self-loathing and extasy. I'm no longer under the gaze of the "All Seeing Eye". I'm no longer trying to cram my brain with absurd notions. I'm no longer plagued by guilt (which is really false guilt) over things I've done, things I should have done, thing I ought to have done. I am a lot easier on myself.
My life is not a bed of roses. I still have lots of things to struggle with, but it is 100% real and I accept no alternatives.
No-one taught me to become an agnostic. I'm still wary of the term atheist.
Plus, it frees up Wednesday evenings and the whole of Sunday.