AskHistorians Aloud -- Manichaeism and its Discontents

Today, the always-fantastic lcnielsen combines a number of his previous answers on Manichaeism to give us a fantastic overview of what it is and what it entails! See his answers on the topic here: Manichaeism is the only major world religion I could think of to be completely destroyed across multiple national boundaries as the result of severe persecution. What about Manichaeism was so terrifying to every single polity in late antiquity that caused such persecution? Why did Zoroastrianism stop spreading?, was it because the Persian Empire was conquered? Has there ever been a movement to unite Islam, Christianity and Judaism? If so, did any of its proponents draw a similarity between the Holy Trinity and the three branches of Abrahamism?