Boston Celtics Coach Joe Mazzulla wears his faith on his sleeve, so much so that it makes reporters uncomfortable. The coach (whose team currently leads the Dallas Mavericks 3-0 in the NBA Finals) made headlines last week for doing exactly that. As it turns out, however, this was far from the first time Mazzulla has thrown reporters off guard — and gone viral for doing so — by speaking up about his faith. He has done so at least two other times in recent memory. Last week’s viral moment was especially notable, however. On June 6, when a reporter asked Mazzulla to comment on the “historic” na…