4. Restrictions on carrying arms and ammunition into a religious institution.- No religious institution or manager thereof shall allow the entry of any arms or ammunition or of any person carrying any arms or ammunition into the religious institution:
Provided that nothing in this section shall apply to-
(a) the wearing and carrying of a Kirpan by any person professing the Sikh religion; or
(b) any arms which are used, as part of any religious ceremony or ritual of the institution as established by custom or usage.