Bill, A friend of mine moved to  China with his wife and several children ~20 years ago. He was  more or less sent by a church upon graduation from Bible School.  Although the authorities very clearly frown upon overt religious activities, he charged ahead, conducting Bible studies and baptizing people. He was betrayed by one of his converts and expelled from the country; his wife ran off with a local man rather than return to the States. His family was destroyed and he returned to alcohol for solace [sober for many years prior].

His wife eventually made it back to the States but in the end, they divided the children, divorced, and he, sober again, remarried. This family was a model family, bulwarks in the community but their adventure as "missionaries"destroyed their marriage. They ventured out in faith but their adventure cost them nearly everything.