You’ve touched on a number of the things that give religious organizations cohesion and strength. The indoctrination is important when it comes to reinforcing those things and building on them. Health cooperatives, college scholarships, support when life circumstances hammer you into the ground… there’s a lot of benefits to being a part of the system. Most people never realize how much they’ve lost by being a part of the system. Why? Because they’re kept ignorant of the things they’ve lost. Keeping that knowledge and experience away from them is important to maintain the desired control.