Why does Crystal enjoy church so much?

The church provides Crystal with a spiritual home, a vital support network at a time when she seems to have hit rock bottom. And things are pretty grim for Crystal; having been evicted, she's out on the streets with no money, selling herself to survive. Crystal has spent her whole life moving from place to place, first in the care system, and then as an adult with numerous mental health issues. The church is about the only place that can provide some kind of stability in her life, some measure of permanence. Crystal's faith offers her much-needed hope, albeit in a somewhat unorthodox fashion. Even when she has little money left—which is virtually the whole time—she donates most of what she has to the church. Crystal believes that by doing this, God will eventually bless her with wealth. This hope, as with everything else associated with the church, gives Crystal something to live for.