If it's zoned agricultural would it need to be changed? If the land is donated to the church it may not be taxable as it's a religious organisation and any taxes might have to be paid by donations specifically earmarked for that. As for the legal structure, I would see if anyone in the congregation is a lawyer and, instead of running them out of town, see if they'll advise and set it up pro bono. If not, approach lawyers until you find someone who'll do it. You might also check with
Farm-to-Consumer Legal Defense Fund to see if they will help or can point you in the right direction.