With the early Church, Calvinism fervently holds that "outside the Church is no salvation." At its heart, however, Calvinism is theology, true religion; and this means doctrine.
Ang Calvinism din ay kaisang bahagi sa Iglesia, ang organisadong Iglesia, at hindi lamang ito personal na paniniwala ng isang indibidwal; ito, mula sa unahan hanggang dulo, ay pang-iglesia.