It is very tragic but the stigma of mental illness stops most families from pushing their family members into psychiatric care. My own mother was a psychiatric nurse but when I showed clear signs of bipolar disorder (then called manic depression) she chose to have me "work harder at being normal." Whatever that meant. Luckily, I was never violent (most people with mental illnesses are victims of crimes, not perpetators according to NAMI statistics).
It is very hard to "force" someone into therapy. You can go along with them, encourage them, beg them. But anagosia is real (the condition that makes a mentally ill person believe he or she is Not ill). 
I do not fault the church for trying to help. I fault society as a whole for stigmatizing people who have brain disorders.