There is some confusion as to what is a Humanist celebrant. Recently a bride asked me if I was available to conduct her Humanist ceremony. Luckily, I was. They had booked someone else whom they thought was a Humanist celebrant but when they went to the HSE to give their three-month notification of their intention to marry (which everyone has to do) they discovered that their celebrant actually conducted religious ceremonies.
Humanist celebrants offer non-religious ceremonies. If they are accredited by the Humanist Association of Ireland (HAI) and the General Register Office (GRO) they can conduct legal non-religious weddings.
If you want a legally binding and legally recognized Humanist wedding ceremony be sure that your celebrant is accredited by both the Humanist Association of Ireland and the General Register Office (GRO).