Preach the Gospel always. If necessary, use pie charts.
Someone has said he would love to see how I incorporated Venn diagrams into the RCIA presentation I gave some months back. (Notably, he didn't ask whether I incorporated Venn diagrams.)
I am here to help. Here are the first five slides of my presentation (not counting the title slide):
As you can tell, it was a presentation on the Liturgy. The above set up a go-back fifteen slides later: