Those who want to advance on the road to God should do everything with sincerity. Sincerity is the only thing that you can offer to God which He accepts and praises. It is the only thing God entrusted in your custody. Everything else in the universe belongs to God. By advancing spiritually while maintaining their families and occupations, they believe they can create a world of true sincerity and enlightenment called God's Kingdom on earth.
Sincerity is a human quality that can be admired but one can be sincerely wrong.
Case in point, their religion. Hardly a comparison to Jesus who died and rose again.