I vividly recall over 25 years ago debating Water Baptism vs. BOD with two priests in an SSPX chapel residency. The priests (one now in the FSSP and the other still SSPX yet very infamous now) vehemently defended BOD in ways that were unmistakably Pelagian.
It is quite shameful that Catholics know so little about the Celtic monk Morgan (Pelagius) and his doctrines. As a result, Pelagianism is amongst the most frequently encountered errors in the Church today, circulating even commonly in otherwise traditionalist quarters.