Henry R Van Til, once said that culture is religion externalised, I believe that he is using the word religion synonymous with belief, meaning that people’s beliefs creates a certain kind of culture. It follows that wherever you have dominant beliefs you will have a certain type of culture, Nazi Germany was based on certain beliefs and with it you had its cultural influence. Certain parts of other countries have islam as the dominant belief and with that belief you have its cultural influence. What then, can we expect to happen and experience when Christians begin to believe that their salvation is independent from the church, when in fact we are saved into the body of Christ. If belief in Christ is separated from belonging to His body the church, then the witness of the church disappears, the Christian community disappears as a witness.
The church is belief externalised. What we believe is externalised in how we worship God, especially on Sunday. We believe that “[Jesus] … is the image of the invisible God, the firstborn over all creation. 16For by him all things were created: things in heaven and on earth, visible and invisible, whether thrones or powers or rulers or authorities; all things were created by him and for him. 17He is before all things, and in him all things hold together. 18And he is the head of the body, the church; he is the beginning and the firstborn from among the dead, so that in everything he might have the supremacy. 19For God was pleased to have all his fullness dwell in him, 20and through him to reconcile to himself all things, whether things on earth or things in heaven, by making peace through his blood, shed on the cross.” (Col 1v15-20)
That belief produces a culture, that culture is the Church and that culture should be visible.