Our church's 神父 also mentioned the same thing : 當初為咩返教會、為咩去領洗,並吾重要,重要既係日後既信德。
But I witness many parents no longer attend Sunday Mass after they got baptized. I feel very disappointed. But I would say there are still some parents attend every Sunday Mass after baptized. 日後既信德 only applies to some parents.