Cultural Christianity is the reduction of Christianity to an identity.
Cultural Christians share language, conventions, and practices around Christian themes but do not recognize the deity of Christ nor submit to His authority as evidenced by their dissimilarity to His Biblical account.
The key characteristic of Cultural Christianity is the preeminence of the group. Cultural Christians prioritize membership to the group above submission to Christ.
Being a Cultural Christian does not require regeneration, belief or any lifestyle change besides participating in group-sanctioned activities that signal their affiliation. Membership is granted on the basis of conformity to the group.
Cultural Christianity adds members largely through cultural assimilation: the often unconscious adoption of the positions and behaviors of others whose acceptance is desired. It seeks cultural belonging and influence, not the Kingdom.