There is created the South Carolina Wind and Hail Underwriting Association, an unincorporated association whose responsibilities, liability, and regulations are governed and defined by this article, consisting of all private insurers authorized to write and engage in writing property insurance within this State on a direct and statewide basis, but excluding insurers whose writings are limited to property wholly owned by parent, subsidiary, or allied organizations, or insurers whose writings are limited to property wholly owned by religious organizations, provided, however, as a condition of exemption from membership such insurers providing property insurance for insurable property in the coastal area as defined by this article shall also provide essential property insurance for such risks. Every such insurer must be a member of the association and must remain a member of the association so long as the association is in existence as a condition of its authority to continue to transact the business of insurance in this State.