Why do Enders mother and Alain suppress their religions?

Graff notes the background of Ender's parents. Both were very religious (Mr. Wiggin is Catholic; his wife, Mormon). While they are still feeling their religions' call for a large family, they are ashamed of their non-compliant family. It will be easier without Ender around. This society is a dystopia of sorts. It is rigidly controlled by the state so any loyalties to other ideas or organizations is discouraged.