Would this game allow me to Protestantize Ireland?
Not due to the time span. The closest thing would be to convert Ireland to one of the Catholic heresies in the game (Cathar, Fraticelli, Lollard and Waldensian), with some special dynamics such as the Fraticelli having a Pope (unlike the other three) and the Cathars having stronger female succession laws and allowing greater participation of women as military commanders or councilors. And the Lollards and Waldensians don't seem to have anything special, it's mostly flavor.
