You are FORCED to take 30% of your paycheck in a gift certificate to this grocery store. You can't renegotiate with your employer asking for more money and less gift certificate.
You are not mormon.
The grocery store has alcohol in its location for people who aren't hired by the mormon church (they buy it at a normal price), they can buy it just fine but you can not. You can't buy the alcohol for you have that gift certificate, you can't even buy the alcohol with your own money. I repeat you are not mormon.
You can buy your alcohol out of state via the internet but it costs 5 times the normal price since they have to ship it from out of state. Now the normal price is the same in all the states even at your local Utah grocery store, but still you have to pay 5 times the price since you are a "member" of this grocery store even though you have no control over getting paid 30% of your wages in a gift certificate.