Army bomb experts were called to the scene of an alert at St Mary's Star of the Sea on the Shore Road and later removed the item for further examination.
The alert has since ended and been declared a hoax.
Roads in the area were closed for a time and a service that had been due to be held in the church was moved to Greencastle Church.
Local Alliance councillor Billy Webb said there could be no justification for an attack on a church.
"I am appalled that a place of worship has been targeted. There is no justification behind it," he said.
"This follows a pipe bomb that was found outside a Catholic church in Ballyclare on Friday. These types of incidents are completely unacceptable."
Mr Webb urged anyone with information to contact police.