Regarding Ms. Koolaid Blood: for her the locus of control in her life is God. This is not uncommon. For others, the locus is themself and for others it is their doctor. For those who want to let God be in control, I think it might be helpful to engage the assistance of a chaplain or member of the clergy who might explain that "God has no hands but your hands." which is to say that patients must work in collaboration with God (take responsibility) to preserve their lives.
Speaking of life, although the "next life" is a goal in several faith traditions, there is also the belief that this life, that all life, is a gift from God and that this gift must be protected and preserved. It is sinful in some faith traditions to neglect one's health or fail to treat a treatable illness (to neglect one's health). Every day, every minute is a gift from God and if people want to praise God for life, (and one would hope, to thank God for your life and your work as a care provider), why should you care?
A physician from any faith tradition or with no faith at all can understand and use the internal logic of a patient's religious belief to motivate the patient to do the right thing and take responsibility for their health and life and to work toward preserving and protecting that life.
As for suing the doctor: even patients of deep religious faith can be the victims of negligence and medical malpractice. Should people of faith let the doctor off the hook?