The church can't pay your personal premiums for ACA insurance, that is a huge ACA violation subject to penalties of $100 per day.
The only legal options are, as I wrote in more detail,
1. The church buys a group employee plan (where the group has 1 member) and pays part or all of the premiums as an employee benefit. They can deduct your share of the premiums pre-tax. Or,
2. The church requires you to buy after-tax insurance on the Marketplace. The church may give you a salary supplement to assist you, but it must be part of your taxable wages. You are then free to buy a plan, claim a subsidy if you qualify, and deduct your out of pocket costs on schedule A.
This is a good resource I should have posted before.
http://www.ecfa.org/PDF/MinTax_Preparing_2019.pdf
