All I can tell you is that Malaysia and Indonesia are Islamic, Singapore mostly Buddhist..
Singapore use to be part of the Malaysian empire (not the right term, more like a joining of several nations, maybe Confederacy is a better term) but was kicked out. Singapore has some bad arse high tech military muscle, a conglomerate of ours, theirs, and Englands best.
I may be mistaken but I believe all three are similar in government to us, well more similar to England, but a 'westerner' wouldn't feel to out of place. English is widely spoken and is even an official language of Malasia??? or maybe it is Singapore... one or the other.
None of this is first had, just news articles, tv, etc etc.. I think of the three Malaysia is the one I'd most want to visit, a huge nation spread across the oceans.. like the Bahamas but with Jungle instead of Beaches.. at least thats what i get off of the travel channel.
And yes I figure you already know all this.. but like Mike said, Keep your ducks in a row or they will kick your Arkansas ass... Kinda like the Wildcats are known to do.