Why aren't christians as diverse as muslims?

Muslims racially seem to hit every continent and then hit every race. I mean many people in bangladesh are of the australoid race. Indonesia has the biggest muslim population in the world and are mostly asian. Many arabs are muslims and are caucasian along with bosnians and albanians who are white too. Also islam is rampant in africa and most of the people there are black. That covers the four races. As to christianity only has white black and many native americans but no people of the australoid race though. They have no influence on east asia. I mean why didn't they convert this area?