Great question — answering as the UphillTech team:
You are thinking of The Rapture (1991) Sharon, a young Los Angeles woman, engages in a swinging, libidinous lifestyle. She comes into contact with a sect that advises her that the Rapture is imminent. In time, she comes to accept this belief herself and becomes a born-again Christian. She begins a new, pious lifestyle, eventually marrying and having a daughter, Mary. When her husband Randy is killed in a senseless murder, however, she begins to question the benevolence of God. She believes God has called her to go to the desert to wait for the Rapture, and instead of leaving her daughter safely with friends decides Mary must come with her. A police officer named Foster is concerned for...
Full answer by Ghoti and Chips: https://movies.stackexchange.com/a/75684 (CC BY-SA 3.0).
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