By Father John P. Cush, EWTN News - In order to understand this, I think it is necessary for us to ask five questions: first, what is a heresy and who is a heretic? Second, what was this particular heresy of Gnosticism? Third, who was St. Irenaeus and what did he do to combat this heresy? Fourth, how is this heresy alive and well in the United States today? And fifth, how can we combat this Gnosticism in our lives and in our world? I hope to explore these themes over my next few articles.