Did they put a gun to his head to force him to write and sign the previous letter?
Oh, they threatened to remove him from his job. He thought it was OK to lie about his faith to keep his job, but then he got a better offer from the druids he has been working with, so now he doesn't need the job.
So he wants to take back his lie, but rather than own up to lying to keep his job he wants to play the victim.
OK, I admit, I don't know if he actually got a paying job with the druids, but it sounds from his note like he did.
And his wife also left the church. She was also a priest. Odd isn't it that two separate individuals who were each qualified to be priests of a church simultaneously decided to renounce their faith? Is it possible that one of them was under the influence of the other?
The nice thing about Christianity is its absolute nature. We know that it can't just be seen as an evolution of some prior belief (such as druidism) because it is based on the life of a single individual who lived within recorded history and claimed to be God come to earth to save us.
Believe it, or don't believe it, but the concept of God being made man to die for man is not something you find in any other religion (lots of them claim men become god, or men are god).
If this priest truly believes his prior christian faith was merely an extension of the "truer" belief in the druidic precursors, he must not have had a good understanding of his christian faith before.
At least he renounced his vows first. You have to look on the bright side.