Sorry you have to deal with this. But life does give us lemons! I read thru everyone's suggestions that have responded to your request and I agree with much of what has been said and will try to no reiterate their good advice.

Be realistic about this place. Do NOT feel obligated to stay because it is a church friend's place. IF YOU ARE SURE THIS IS THE PLACE GOD WANTS YOU TO LIVE, Then it's time to make lemonade of the situation! Your relationship has changed, the Landlord/tenant relationship is now priority! Make copies of any correspondence from the beginning of your agreement to consider this place. If it was done through in person or phone calls, sit down and chronicle each interaction- date, time, content as best you can. Continue to keep a log. Be sure to get and keep any receipts from repair persons . The wording from LightHeartAnon is perfect for a letter. Don't rely on phone calls to initiate your intentions. If landlord calls, record or take notes. date/time.