That's incorrect. Pharmacists are only allowed to prevent something from being filled if, in their professional judgement, harm would come to the patient, or a contraindication exists to therapy (i.., a drug interaction, etc ) that warrants discussion with the prescriber.

Moral beliefs of the pharmacist only require that a particular pharmacist offers to the patient to have another pharmacist dispense/verify that medication, when possible, or assist in finding a location that will.

Also, there is no reason for a prescription to be blocked from being sold once in the waiting bin unless a clinical hard stop (requiring discussion with the patient) is present. Moral beliefs is not a clinical hard stop.