Yelling praises to their God, while offering human sacrifices.... hmmmm, I thought those religions disappered (with the exception of satanism) a few thousand years ago?
BINGO! That's exactly what this is, pure and evil.
It is my contention that Muhammed was NOT a prophet, but a mental case, suffering delusions of granduer. Probably schizophrenic. Yeah, he heard voices but they were not God (or Allah). They were probably beelzebub himself.
Yelling? Or demented screeching? Something like the screeching that is going on now in hell, where these suicidal slaughters of innocents are frying right now.