Anthropology

... and it appears to support something I read a few years ago: That Persians – now Iranians – are of Caucasian heritage, not Arabic. Their only similarities are religious, and even then, not the same sects; Iran is Sunni, the Arabs, largely Shiite. But, as in all things religious, the differences are enough of an excuse for countless wars.
If the species doesn't consume itself in a nuclear holocaust, humanity might someday abandon religion altogether, finally embrace our differences, rather than kill each other over them, and mega-church charlatans will be remembered as a failed evolutionary hiccup, and speaking in tongues will be a punchline.