There's this one cathedral in Spain where they sell a rather impressive timeline of Christian history from the very beginning to now - the whole thing folded out is like ten meters long and covers really pretty much everything. At times in nicely polemic "we Catholics rock, everybody else is scum" tones, but hey, it's Spain.

On the other end of the oecumenic sentiments spectrum, I bought a poster in another church of a massive tree splitting into three branches - Judaism, Christianity, Islam - and then dozens of smaller branches. It's awesome. Of course, most everything else in that gift shop was fairly tacky, so I'm not really disagreeing with your basic point.