I fail to see the point you're making. Rock and Roll and Jazz are both artistic and musical movements. They're neither, in my opinion, signficantly religious or culturally iconographic (though I will admit that religion has affected both forms of music and that they're iconic of black culture in a way, but not iconic as in "this static image represents black America"). I'm also completely aware that regional, cultural, and linguistic proximity leads to blending, acknowledge that, and am not disputing it. The original point I was making, is that beyond things like art or clothing or music, is that religion has a deeply personal value to people of all cultures and that I think its understandable that many people think it's important that others be respectful of the significance of belief systems that to them are very profound. I'll also say that I'm well aware that the sharing of and blending of religious beliefs is very much a part of every religion and plays a role in the development of religious thought and philosophy throughout history. Once again though, I think it's important to point out that a large part of that sharing is through proximity and an admiration of the viewpoints of others, and that there is a difference, but the lines are blurry.