The Highway Forums General Discussion Open Forum Almost Every Leader of the Reformation Attacked?

You emphasized Calvin's time, so I took that as being the time limiting factor and the period one should focus their attention on. Thus, I voted for the Eucharist, although there were a number of other doctrinal issues being debated, e.g., "predestination"; cf. Calvin vs. Pighius in [i]The Eternal Predestination of God[/i].