Dunking sounds so pedestrian. To baptize, from the Greek baptizein, means to "plunge" or "immerse". But anyone professing to have actually been a practicing Catholic would know that for Catholics Salvation is a process, not a "once and done" event".
"He who believes and is baptized will be saved; but he who does not believe will be condemned" - Mk 16:16.
So then you deny the doctrine of your own church?