crisis christian
A follower of the Christian Faith or a Christian-related faith who only attends church in a time of crisis. This is moderately similar to a Holiday Christian though the attendance of a Holiday Christian is more predictable. Crisis Christians may attend church for consecutive weeks (or even days) in their time of need and not give it a second thought once their prayers have been answered.
Person 1: "My husband lost is job. We went to church every week and prayed for a miracle. Now he has a fantastic job and we don't need to go to church anymore!"
Person 2: Well you're quite the Crisis Christian, aren't you?
Person 2: Well you're quite the Crisis Christian, aren't you?