He agreed with that!Pelagius didn't believe this. Why are you naming this after him?
Pelagianism - Wikipedia
" Pelagianism, also called the Pelagian heresy, is the Christian theological position that the original sin did not taint human nature and that mortal will is still capable of choosing good or evil without special divine aid or assistance. This theological theory is named after the British monk Pelagius (c. AD 360 – 418),"