To answer your second question, Jesus is God in human form. Therefore he provides an exemplar of what God (in his spiritual fom) is like - loving, caring, slow to anger, ...
Has God 'revealed' Himself to other cultures in a similar way or only to an incredibly small minority in the Middle East?
He's 'revealed' himself to me, and I've never been to the Middle East. I know of people in Japan, Korea, China, Australia, India, Nepal, Afghanistan, Iraq, Israel, Russia, Poland, the Czech Republic, Austria, Finland, the Low Countries, Eire, Greenland, Canada, the USA, Mexico, Brazil, Chile, etc., etc. (and that is simply a small sample of such places), to whom he has revealed himself. It is why Jesus instructed his disciples to 'Go into all the world and make disciples' (an instruction that was passed on generation by generation; they were to be Christ to those thy met.